Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 178628: area of a rectangle= 220 square feet. find the dimensions of the figure
x-9 is the width and the length is x.
Click here to see answer by solver91311(16872)

Question 178665: f(x)= -1/2x^2
Click here to see answer by Alan3354(30993)

Question 178718: Solve the following by substitution
2x-y=10
x=-2y
Click here to see answer by jojo14344(1512)

Question 178721: Tell whether the quadratic function has a maximum value or minimum value. Then find the value and round to the nearest tenth.
y= -x squared - 2x+5
I'm not sure how to find maximum or minimum values..
Thank you
Click here to see answer by stanbon(57282)

Question 178883: The equation is tickets= -0.2x^2+12x+11.
what would be the last day tickets are sold? How many days would the peak occur?
Click here to see answer by nerdybill(6951)

Question 178874: x^2+8=4t
Click here to see answer by solver91311(16872)

Question 178903: 2x^2+5x-12=

Click here to see answer by jojo14344(1512)

Question 178985: Use the following equation, where x and y are measured in meters, to model a cross section of the Barrenger Meteor crater, near Winslow, Arizona.
Barringer meteor crater model= y=1/1800(x-600)(x+600)
what is the depth of the crater?
Click here to see answer by ankor@dixie-net.com(15645)

Question 179311: Just like my other question, I keep coming with wrong equations, these are my final assignment and I have to get it right...I need help in word problems, my weakest part is comming up with the right equation...
Kim starts to walk 3 mi to school at
7:30 A.M. with a temperature of 0°F. Her brother Bryan
starts at 7:45 A.M. on his bicycle, traveling 10 mph faster
than Kim. If they get to school at the same time, then how
fast is each one traveling?
Click here to see answer by stanbon(57282)

Question 179308: Time off for lunch. It usually takes Eva 3 hours longer to
do the monthly payroll than it takes Cicely. They start
working on it together at 9:00 A.M. and at 5:00 P.M. they
have 90% of it done. If Eva took a 2-hour lunch break
while Cicely had none, then how much longer will it
take for them to finish the payroll working together?
Click here to see answer by josmiceli(9664)

Question 179283: Arectangle 6 feet by 8 feet has a border of uniform width around the inside of all four edges. If the border has an area of 33 square feet, how wide is the border?
Click here to see answer by checkley75(3666)

Question 179279: A 7-INCH BY 10-INCH RECTANGLE HAS A STRIP OF UNIFORM WIDTH, X INCHES, AROUND ITS OUTSIDE. IF THE AREA OF THE STRIP IF 50 SQUARE INCHES, WHAT IS THE WIDTH OF THE STRIP?
Click here to see answer by checkley75(3666)

Question 179354: P=24x^+120x/x^+8x+15

Click here to see answer by ankor@dixie-net.com(15645)

Question 179376: An original quadratic equation for x is of the form: x^2+bx+c=0. If c is increased by 4, the roots for x of the resulting equation are equal, but if the original c is decreased by 5 one of the roots for x in this resulting equation is twice the other. Find the product of the roots for x in the original quadratic equation.
Click here to see answer by josmiceli(9664)

Question 179402: Hello I need hepl with this equation. f(x)=-5x+8 at f(-3), and f(x)=3xsqr.-4x-3 at f(x-1)
Click here to see answer by vleith(2825)

Question 179152: Pleae help.
Find all real and imaginary solutions to each equation.
b^4+13b^2+36=0
Click here to see answer by monika_p(71)

Question 179282: Matt makes a cardboard frame to go around the edges of an 8cm * 10cm photograph. The frame has an area of 63 square centimeters and is of equal width all the way around. What is the width?
Click here to see answer by edjones(7569)

Question 179456: Solve using completing the square:

I think I have to put the constant on the other side of the = but I am not really sure. Thank you ahead of time.
Click here to see answer by stanbon(57282)

Question 179458: Solve using the quadratic formula:
Thank you so much.
Click here to see answer by Alan3354(30993)

Question 179455: I need help with this Quadratic Equation:
Solve using the square root property:

I know that I have to get rid of the ^2 but I am not sure how. Thank you so much.
Click here to see answer by stanbon(57282)

Question 179457: I am having trouble with the quadratic formula:
Thank you for your time.
Click here to see answer by stanbon(57282)

Question 179457: I am having trouble with the quadratic formula:
Thank you for your time.
Click here to see answer by nerdybill(6951)

Question 179281: A rectangular tract of land 20m by 30m has part of its area covered by an I-shaped road, which goes around two sides. The road is the same width on both sides, and its area is 184 square meters. What are the dimensions of the part of the tract of land not covered by the road?
Click here to see answer by ankor@dixie-net.com(15645)

Question 179511: Solve by completing the square:
x^2+6x+4=0
Thanks :)
Click here to see answer by stanbon(57282)

Question 179510: Solve using the square root property:
1. 2x^2=40
2. (x+3)^2=49
Thank you ;)
Click here to see answer by jim_thompson5910(28536)

Question 179509: Solve using the quadratic formula:
1) x^2-2x=15x-10

2) x^2-3x-3=5

Thank you for the help ;)
Click here to see answer by jim_thompson5910(28536)

Question 179529: Walt made an extra $12,000 last year from a part time job. He invested part of the money at 7% and the rest at 9%. He made a total of $970 in interest. How much was invested at 7%?
Click here to see answer by MissionPossible(18)

Question 179535: Solve by factoring:
x^2-5x=6
Thanks for your help and time ;)
Click here to see answer by edjones(7569)

Question 179156: Please help.
Find b^2 _4ac and the number of real solutions to each equation.
1. 9m^2 + 16 = 24m
2. -3x^2 + 7x =0
Click here to see answer by edjones(7569)

Question 179554: Joe has a collection of nickels and dimes that is worth $6.05. If the number of dimes was doubled and the number of nickels was decreased by 10, the value of the coins would be $9.85. How many dimes does he have?
Click here to see answer by nerdybill(6951)

Question 179557: T= -0.2x^2+12x+11
the questions are:
what is the point of the vertex? what do the soulations represent?
Click here to see answer by stanbon(57282)

Question 179560: 3. Walt made an extra $12,000 last year from a part-time job. He invested part of the money at 7% and the rest at 9%. He made a total of $970 in interest. How much was invested at 7%?

Click here to see answer by Earlsdon(6287)

Question 179559: An express train and a local train both leave Gray’s Lake at 12:00 noon and head for Chicago 60 miles away. The express travels twice as fast as the local and arrives 2 hours ahead of it. Find the speed of each train.
Click here to see answer by checkley77(12569)

Question 179592: I need help with this problem. I'm so confused!
Solve using the quadratic formula
x^2-3x=-3
Thank you very much
Click here to see answer by jim_thompson5910(28536)

Question 179605: Find all real solutions of the quadratic equation. (Enter NONE if a solution does not exist.)
x^2- + 3= 0
i subtracted 3 and x^2 to the other side to isolate the radical
-= -x^2-3
then i squared both sides of the equation to get rid of the radical and got
13x= x^4+6x^2+9 i then subtracted 13x to get all the variables on one side
x^4+6x^2-13x+9=0 i don't know how to solve the rest of the problem. I tried moving the 9 to the other side then factoring out an x and trying to factor the rest of the problem but didn't work i also tried completing the square that didn't work either

Click here to see answer by Alan3354(30993)

Question 179577: Write a quadratic equation in the form ax^2 + bx + c = 0 with the given roots: -1/2, 5.
Click here to see answer by Mathtut(3670)

Question 179617: I need to create a real life situation that fits the equation (x+3)(x-5)=0 and express the situation as the same equation.
Click here to see answer by Mathtut(3670)

Question 179618: The Hudson River flows at a rate of 5 miles per hour. A patrol boat travels 40 miles upriver , and returns in a total time of 6 hours. What is the speed of the boat in still water?
I have figured the distance is 40 miles with a speed of r-5 upstream and r in still water, and the total time is 6 hours but I still can not figure out how to write the equation and solve it.
Click here to see answer by stanbon(57282)

Question 179656: I know this isn't a quadratic equation, but it is stumping me none the less. I'd really appreciate any help I can get. Thanks,
solve;
10x^4-19x^3+6=0
Click here to see answer by stanbon(57282)

Question 179708: Simplify the following:
sqrt(98m^4)

Click here to see answer by ptaylor(2048)

Question 179709: Simplify by combining like terms:
5sqrt2 - 2sqrt18
Click here to see answer by ptaylor(2048)

Question 179715: Find the distance between these two points:
(6,4) and (-3,5)

Click here to see answer by Edwin McCravy(8893)

Question 179712: Solve. (Be sure to check your solution):
sqrt(2y + 7) + 4 = y

Click here to see answer by Fombitz(13828)

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, 20206..20250