Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 998372: How do I find a, b, and c for quadratic equation from a table? X is 2, 4, 6, 8, 10, 12. Y is 56, 64, 62, 53, 43, 18
Click here to see answer by Alan3354(69443)

Question 998465: Find all zeros of the trinomial. k(x)=6x^2+x-40
A. x=-5/2 or 8/3.
B. x=-5/3 or x=8/2.
C. x=5/3 or x=-4.
D. x=5/2 or x=-8/3.
help please thanks.

Click here to see answer by MathLover1(20849)

Question 998474: Every Week that a farmer waits, his potato crop increases 100 bushels, but the price drop 10 cents a bushel. If he digs potatoes today, he would have 600 bushels worth $1 per bushel. Show that he should dig and sell his potatoes at the end of two weeks.
Click here to see answer by Theo(13342)

Question 998570: Find all the zeros of the trinomial k(x)=x^2+10x-200. Thanks
A. (-10,0) , (20,0)
B. (-5, -255), (0, -255)
C. (0,10), (0,-20)
D. (10,0), (-20,0).
Click here to see answer by fractalier(6550)

Question 998572: Find in the form y=ax^2+bx+c, the equation of the quadratic whose graph cuts the x-axis at 5, passes thrpugh (2,5) and has axis of symmetry x=1
Click here to see answer by stanbon(75887)

Question 998541: Given the quadratic function y = 1 + 4x - x2 . Suppose the domain is restricted to the interval (-�, 4), what is the corresponding range of the function in interval notation?

A. (-5/4, 1)
B. (-5/4, 5)
C. [-5/4, 5)
D. (-5/4, 5]
E. (-5/4, 1]
My solution was to sub both domains in the equation and the answer was -5/4 and 1 but i am confused which one i am going to answer A or E
Click here to see answer by Alan3354(69443)

Question 998538: Given the quadratic function y = 1 + 4x - x2 . Suppose the domain is restricted to the interval (-�, 4), what is the corresponding range of the function in interval notation?
Click here to see answer by ikleyn(52778)

Question 998608: http://prntscr.com/8ulo9k
copy and paste the link please.
Help please
Click here to see answer by josgarithmetic(39617)

Question 998400: a student bought some packets of pen for 2000 dollar. if she had paid 24 dollar less for each packet she could have bought 3 more packets. how many packet of pen did she buy?
Click here to see answer by ankor@dixie-net.com(22740)

Question 998644: 1.Solve for x in the following quadratic equations by factoring.
a.x2−8x+16=0 (3 marks)
b. x2+14x=0 (4 marks)
c.6x2−7x−3=0 (4 marks)
d.x2−(72)x+32=0 (4 marks)
2.Solve for x in the following quadratic equations using the formula. State your answers in fraction or whole number form or round decimals to the nearest tenth. (3 marks each)
a.5x2−8x−4=0
b.3x2+2=4x
c.9x2+12x+4=0

Click here to see answer by mananth(16946)

Question 998656: What is the value of k so that the equation 2x2 + 4x - 17 = kx has roots numerically equal but opposite in sign?
Click here to see answer by josgarithmetic(39617)

Question 998657: The graph of the quadratic function y = -x2 + x + 2 is a parabola.
What is the range of the function?
What is its vertex?
What is the equation of the axis of symmetry?

Click here to see answer by josgarithmetic(39617)

Question 998691: The length of the rug is 4 feet more than Its width. Find the dimensions of the rug if it's area is
x^2-8x+12
Click here to see answer by Boreal(15235)

Question 998714: How do I put y=(0,0)(5,7)(10,0)(12.5,-3)(15,0)(16.5,1)(18.5,0)(18.5,0) in standard form?
Click here to see answer by Alan3354(69443)

Question 998973: The citizens of harrington county aer wild abou their dogs. they have an existing dog park fo dogs to play, but have decided to build another one so that one park will be for the mall dogs and the other will be for the large dogs. the plan is to build a rectangulare fenced in are that will be adjacent to the eisting dog park. the sketch is shown below. the county has enough money is the budget to buy 1000 feet of fencing. determine the length of the new dog park, l, in terms of the width'
Click here to see answer by addingup(3677)

Question 999099: . The original plans for Jennifer�s house called for a square foundation. After increasing one side by 30ft and decreasing the other by 10ft, the area of the rectangular foundation was 2100 sqft. What was the area of the original square foundation? Can someone please solve this for me and show all of the work? thanks so much!
Click here to see answer by Theo(13342)

Question 999204: How do I write a quadratic equation with roots -4 and 5 in standard form?
Click here to see answer by ikleyn(52778)

Question 999204: How do I write a quadratic equation with roots -4 and 5 in standard form?
Click here to see answer by stanbon(75887)

Question 999309: X hours at 12 kind h and y hours at 16km/m the stud cycles 66km is shows. Find x and y
Click here to see answer by ikleyn(52778)

Question 999388: The product of two positive numbers is 576. What is the minimum value of their sum?
Click here to see answer by fractalier(6550)

Question 999447: For the problem f(x)=�2+2x-15, I need to find the vertex, the x and y intercepts, axis of symmetry, and the concavity.
If you could show how you got your answers so I can try to solve it and get the right answer, that would be awesome. I need to understand HOW to do the problwm so I can solve all the other questions on my homework.
Click here to see answer by Fombitz(32388)

Question 999688: Struggling on how to find an equation when only given these three coordinates:
(4,-10), (11,5), (23,17)
Seems like it should be a quadratic eq, but confused without any x or y axis values.
Click here to see answer by Fombitz(32388)

Question 999760: Find the error in each of the following and provide an explanation of the mistake made.
a). 𝑥2+25= (𝑥+5)(𝑥+5)
b). 10𝑥3+15𝑥2+5𝑥 = 5𝑥(2𝑥2+3𝑥)

c). 𝑥2−2𝑥+24= (𝑥−6)(𝑥+4)

Click here to see answer by ankor@dixie-net.com(22740)

Question 999759: A square warehouse has sides of length of 200 feet. The owner wishes to use 160 feet of fencing, which he has on hand, as three sides of an enclosed rectangular garden, using the warehouse as the fourth side. What is the largest number of square feet that can be enclosed?

Click here to see answer by ankor@dixie-net.com(22740)

Question 999860: Given the parabola in which the vertex is the origin and the directrix is a horizontal line passing through the point (0,-7), a student determined that the parabola opens to the right and that the equation of the parabola is y^2=28x. Evaluate the student�s answer. A. The student�s answer is correct. B. The student determined the direction of the parabola correctly but did not correctly determine the equation of the parabola. C. The student determined the equation of the parabola correctly but did not correctly determine the direction of the parabola. D. The student used the equations for a horizontal parabola instead of a vertical parabola. Both the equation and direction of the parabola are incorrect.
Click here to see answer by Theo(13342)

Question 999922: Each function h (t) below represents an object being thrown upward with an initial velocity after t seconds. For each function find the time that it takes to reach the ground. a)h(t)=-16t2+64t+960 b)ℎ(𝑡)= −16𝑡2 +80𝑡+576 c) ℎ(𝑡)= −16𝑡2 +64𝑡+960

Click here to see answer by MathLover1(20849)

Question 1000048: y=�7x2+70x�153 intersects y=�4x2+40x�78 at
Click here to see answer by josgarithmetic(39617)

Question 1000102: Good day great people... Please I am having problems with how this expansions was done
a^2+b^2=a^2+2ab+b^2-2ab...
It's from roots of quadratic equations...where 'a' & 'b' are roots of equation.
Thank you...
Click here to see answer by Alan3354(69443)

Question 1000108: if a & b are roots of a quadratic equation, please explain how
a^2+b^2 = a^2+2ab+b^2-2ab.
thank you.
Click here to see answer by Alan3354(69443)

Question 1000109: if a & b are roots of a quadratic equation, please explain the expansion processes
a^2+b^2 = a^2+2ab+b^2-2ab.
thank you.
Click here to see answer by Alan3354(69443)

Question 1000260: x^2-2x-3
Click here to see answer by mananth(16946)

Question 1000335: a ball is thrown upward from the top of a 64-foot-high building. the ball is 96 feet above ground level after 1 second, and it reaches ground level in 4 seconds. the height above ground is a quadratic function of the time after the ball is thrown. write an equation of this function?
Click here to see answer by Boreal(15235)

Question 1000272: Plz help me to explain the range of this equation...{x^2-2x-3=0}
Click here to see answer by MathLover1(20849)

Question 1000320: Solve and leave your answer on a number line: (x-2) (x+3) (x-4) (x+1)< / = 0
Click here to see answer by fcabanski(1391)

Question 1000273: Plz explain the range of this equation...{1�√x^2-2x-3=0}
Click here to see answer by josgarithmetic(39617)

Question 1000273: Plz explain the range of this equation...{1�√x^2-2x-3=0}
Click here to see answer by Theo(13342)

Question 1000385: determine the equation of the line with gradient of -4 and passing through 6 on the y - axis

Click here to see answer by dkppathak(439)

Question 1000563: A function of two variables is defined as f(x.y)=x^2+y^2+4x-6y+7. What is the minimum value of this function?
Click here to see answer by KMST(5328)

Question 1000840: Solve each equation by completing the square. Show work please.
1. 2x^2-8x=10
2. 3x^2-12x-36=0
Thanks.
Click here to see answer by josgarithmetic(39617)

Question 1000838: solve using the quadratic formula. Show work please,
1. x^2-7x=44
2. 12x^2+5x-2=0
Thank you!

Click here to see answer by josgarithmetic(39617)

Question 1000845: Vertex form of y=3x^2-12x+5 I got (X-2)^2+5/9=y I just want to make sure I'm correct.

Click here to see answer by MathLover1(20849)

Question 1000845: Vertex form of y=3x^2-12x+5 I got (X-2)^2+5/9=y I just want to make sure I'm correct.

Click here to see answer by MathTherapy(10552)

Question 1000805: the length of a rectangle is eight more than two times the width. Find the width if the perimeter of the rectangle is eaual to 88m.
Click here to see answer by Cromlix(4381)

Question 1000937: One pair of integer values satisfy the equation x^2+y^2=100 is x=6 and y=8. Find pair of integer values that satisfy x^2+6x+y^2-4y-87=0. Thanks in advance!
Click here to see answer by stanbon(75887)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 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20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 27136..27180, 27181..27225, 27226..27270, 27271..27315, 27316..27360, 27361..27405, 27406..27450, 27451..27495, 27496..27540, 27541..27585, 27586..27630, 27631..27675, 27676..27720, 27721..27765, 27766..27810, 27811..27855, 27856..27900, 27901..27945, 27946..27990, 27991..28035, 28036..28080, 28081..28125, 28126..28170, 28171..28215, 28216..28260, 28261..28305, 28306..28350, 28351..28395, 28396..28440, 28441..28485, 28486..28530, 28531..28575, 28576..28620, 28621..28665, 28666..28710, 28711..28755, 28756..28800, 28801..28845, 28846..28890, 28891..28935, 28936..28980, 28981..29025, 29026..29070, 29071..29115, 29116..29160, 29161..29205, 29206..29250, 29251..29295, 29296..29340, 29341..29385, 29386..29430, 29431..29475, 29476..29520, 29521..29565, 29566..29610, 29611..29655, 29656..29700, 29701..29745, 29746..29790, 29791..29835, 29836..29880, 29881..29925, 29926..29970, 29971..30015, 30016..30060, 30061..30105, 30106..30150, 30151..30195, 30196..30240