Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 478794: State whether the parabola opens or downward.
1.y=-4+xsquare
2.y=7-xsquare
3.y=2-5x-3xsquare
4.y=2xsquare-3x-2
Click here to see answer by stanbon(57214)

Question 478792: 1.The vertex is(4,-7),and the parabola opens upward.Determine the number of x-intercepts.
2.The vertex is(-5,4),and the parabola opens downward.Determine tne number of x-intercepts.
3.The vertex is(2,0).Determine the number of x-intercepts.
4.The vertex is(4,2),and the y-intercepts is(0,5).Determine the number of x-intercepts.
5.The vertex is(-2,-5),and the parabola opens downward.Determine the number of x-intercepts.
Click here to see answer by stanbon(57214)

Question 478790: The vertex is(3,4),and the parabola opens upward.Determine the number of x-intercepts.
Click here to see answer by Alan3354(30939)

Question 478804: Consider f(x)=x^2+99x+18. find the value of x so that f(2x)=2f(x).
Click here to see answer by ewatrrr(10682)

Question 478755: Can someone please help solve this equation
6x(x-2)(3x+5)<0
Click here to see answer by Theo(3458)

Question 478908: (-4,-4)(9,9) what is the equation of the line?
Click here to see answer by stanbon(57214)

Question 478911: find the slope intercept equation
slope 9 Y intercept 0,5
Click here to see answer by rfer(12644)

Question 478910: x+3y=9
graph using slope and y intercept
Click here to see answer by rfer(12644)

Question 478934: A rectangular fields along a river requires fencing on only 3 sides. What is the maximum area possible with 500m of fencing.
Click here to see answer by cleomenius(959)

Question 478939: complete the square, and find the roots of the quadratic equation.
x^2 + 6x - 16 = 0
Click here to see answer by cleomenius(959)

Question 478949: The length of a rectangle is 2 less than 3 times its width. If the area measures 65 square meters find the dimensions of the rectangle.
Click here to see answer by cleomenius(959)

Question 478942: use the discriminant to determine the number of solutions of the quadratic equation, and whether the solutions are real or complex. Note: It is not necessary to find the roots; just determine the number and types of solutions.
z^2 + z + 1 = 0
Click here to see answer by Alan3354(30939)

Question 478940: use the discriminant to determine the number of solutions of the quadratic equation, and whether the solutions are real or complex. Note: It is not necessary to find the roots; just determine the number and types of solutions.
x^2 + 6x -7 = 0
Click here to see answer by Alan3354(30939)

Question 478865: Please help me.... the problem states determine the nature of solutions of the equation y^2=2/7y+1/7. Thanks!!
Click here to see answer by ankor@dixie-net.com(15622)

Question 478945: use the discriminant to determine the number of solutions of the quadratic equation, and whether the solutions are real or complex. Note: It is not necessary to find the roots; just determine the number and types of solutions.
2x^2 - 10x + 25 = 0
Click here to see answer by Earlsdon(6287)

Question 479050: _Find f(x)=ax^2+bx+c, given that f(0)=-8 and the vertex is (1,-9)
_Find f(x)=ax^2+bx+c, given that the vertex is (2,-1) and the point (4,3) lies on the parabola
Click here to see answer by lwsshak3(6456)

Question 479188: how to solve this on x2+4x=5 by completing the square?

Click here to see answer by vleith(2825)

Question 479248: a door is parabolic in shape and its vertex is 8 feet above the floor. The width of the door way at floor level is 10 feet accordingly, would a 6 foot tall person hit their head, if the person walk through the doorway 2 feet from its center
Click here to see answer by solver91311(16868)

Question 479335: Find 2 positive numbers whose sum is 20 such that the sum of their squares is a minimum.
Click here to see answer by Alan3354(30939)

Question 479420: this is the equation: ( 9x squared - 3x - 6 ) divided by ( 6x + 4)
Click here to see answer by Alan3354(30939)

Question 479551: I'm having trouble factoring out this problem, I didn't know where to post a factoring question so I apologize if this is the wrong place, but im trying to factor out x^2 - 15x - 2 I tried isolating the coefficient and constant and cross multiply to get the two numbers that = -15x, but I'm stumped lol, I'd appreciate a hand! Thannks!
Click here to see answer by mananth(12270)

Question 479701: how do I do this quadratic equation into standard form lesae help fast please.
x^2-10x-6=2x+3
Click here to see answer by rfer(12644)

Question 479701: how do I do this quadratic equation into standard form lesae help fast please.
x^2-10x-6=2x+3
Click here to see answer by Tatiana_Stebko(1326)

Question 479770: Why does -4 of ever become positive?
Click here to see answer by ankor@dixie-net.com(15622)

Question 479770: Why does -4 of ever become positive?
Click here to see answer by Edwin McCravy(8879)

Question 479766: A school planned to buy x calculators for atotal cost of 16,200. The supplier agreed to offer a discount of 60 per calculator. The school was then able to buy three more calculators for the same ammount of money.write an expression interms of x and find the original price of each calculator.
Click here to see answer by htmentor(788)

Question 479900: The height(in feet) of a firework t seconds after it is launched is given by H(t) = 3+180t-16t^
A. the firework is to explode at a height of at least 450 ft.
B. Draw a graph of the height of the firework over time, indicating the times when the firwork is at a height of at least 450 feet.
Click here to see answer by ankor@dixie-net.com(15622)

Question 479996: Subtract the polynomials (2w^2 +4w+4)(9w^2+4)
Click here to see answer by Aswathy(23)

Question 480281: the total profit for a company to manufacture and sell x items per week is: p=-5x^2+40x-300. How many items must be sold to obtain a weekly profit of $300?
Click here to see answer by solver91311(16868)

Question 480361: Identify the axis of symmetry. y = x2 – 5x + 1

Click here to see answer by Alan3354(30939)

Question 480369: Find two consecutive positive integers such that the sum of their squares is 61.
Click here to see answer by wilft1(67)

Question 480369: Find two consecutive positive integers such that the sum of their squares is 61.
Click here to see answer by Alan3354(30939)

Question 480372: -9(x-3)^(2)=-7 Please solve for x.
Click here to see answer by Tatiana_Stebko(1326)

Question 480463: At the local convenience store, 6 bags of chips and 4 containers of dip cost $34. However, 4 bags of chips and 2 containers of dip cost $20. What is the cost of one bag of chips and one container of dip?
Click here to see answer by mathstutor494(95)

Question 480470: x=?
in Equation x^2+4=9

Click here to see answer by Aswathy(23)

Question 480470: x=?
in Equation x^2+4=9

Click here to see answer by mathstutor494(95)

Question 480497: find the roots of the quadratic equation 2x^2-5x+3=0
Click here to see answer by ewatrrr(10682)

Question 480575: 12x^2+7x-12
Factor the quadratic espression completely, and find the roots of the expression.
Click here to see answer by solver91311(16868)

Question 480572: (3)^1/2y^2-4y-7(3)=0
Use the descirminant to determine the number of solutions ot the quadratic equation, and is the solutions real or complex? Not necessary to find the roots, just determine the number and types of solutions
Click here to see answer by solver91311(16868)

Question 480584: 12x^2+7x-12
Factor the Quadratic expression completely find the roots of the expression
Click here to see answer by stanbon(57214)

Question 480584: 12x^2+7x-12
Factor the Quadratic expression completely find the roots of the expression
Click here to see answer by solver91311(16868)

Question 480584: 12x^2+7x-12
Factor the Quadratic expression completely find the roots of the expression
Click here to see answer by ewatrrr(10682)

Question 480446: a picture has a height that is 4/3 its width.it is to be enlarged to have an area of 192 square inches. what will be the dimensions of the enlargement?
Click here to see answer by ankor@dixie-net.com(15622)

Question 480452: what is the quadratic equation of x+3/2=2/x

Click here to see answer by ankor@dixie-net.com(15622)

Question 480750: Solve the following 15x^4-28x^2+5=0
Click here to see answer by emargo19(101)

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, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205