Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 140566: how do you do a quadratic equation without a b value?
Click here to see answer by ptaylor(2052)

Question 140548: please help.find the roots of the quadratic equation y=x^2+7x-18 by factoring Thanks
Click here to see answer by oscargut(900)

Question 140599: Solve and graph.
3x + 9 >_ -15 or 3x + 1 >_ -8
The solution is ??
Help me with this of course the <_ is supposed to be over each other.
The graph's are number lines and are supposed to have either a ( or a [ on the one end and i have no idea how to do these the right way can someone hlp.
Click here to see answer by stanbon(57984)

Question 140597: The perimeter of the rectangle is 190 inches. The length exceeeds the width by 53 inches. Find the length and the width.
Can someone please help with this one please? The perimeter is the 190 diveded by 4? Is that the way to start or not?
Click here to see answer by jojo14344(1512)

Question 140609: Write the expression in quadratic form, if possible;
a8 + 10a2 - 16
Click here to see answer by MeggieMizell(6)

Question 140596: Can someone help me with this one?
Solve this using the substitution method.
3m n = 18
m - 4n = 32
Yikes I really have not figured out how to do these correctly will someone help.
Click here to see answer by MeggieMizell(6)

Question 140594: Miguels insurance will replace his car if costs exceed 80% of the cars value. The car substained $11200 worth of damage, but it was not replaced. What was the value of the car.
What was the value of the car?
Help. Do I multiply 80% by $11200 to get the value of the car?
Click here to see answer by jojo14344(1512)

Question 140640: solve equation using imaginary and complex numbers x^2+4x+24=0
please help! =)
Click here to see answer by jim_thompson5910(28717)

Question 140602: could someone please show me how to do this problem.thanks .
write the equation of the root 2,3
Click here to see answer by edjones(7569)

Question 140595: Is the ordered pair a solution of the inequality?
(-5, 6); 6x + y < -8
Help please
Click here to see answer by edjones(7569)

Question 140676: I need to solve 5x+4y=12 for y. I have tried 5-5x+4y=12-5 4y/4=7/4
From there I'm stuck and I not sure if that is even right because I don't know how to check my work for this type of equation. Thanks, Julie.
Click here to see answer by checkley77(12569)

Question 140743: please help!! use the quadratic equation -b+ (tiny line under the plus sign) sqrt(b^2-4ac)/2a to find the roots of the equation x^2-3x+2=0 thanks for your help.I really appreciate all ya'll do.
Click here to see answer by c-dubb swimmer(3)

Question 140763: Hi I am bnot sure how to do these two problems. I hope some one can help me. Thank you very much.
1. Solve by factoring:
x2 – 9x = -8
2. Solve using the square root property:
2x2 – 5 = 93

Click here to see answer by checkley77(12569)

Question 140774: cpuld someone check this for me.Thanks in advance for your help.
solve the equation by completing the square
x^2+8x-13=0 i got x=-4+sqrt 29,-4- sqrt 29
Click here to see answer by stanbon(57984)

Question 140834: I need help obtaining the derivative value for given:
y=X^2-4X+5

Click here to see answer by stanbon(57984)

Question 140705: Please help me to obtain the derivative. for given: Y=x^2-4X+5
I think the original points are: (X1, X2-4x+5)
and second point should be (x + h, (X + h)^2
next I need to find oy and ox (which = the y2 + y1 and x1 + x2)
This is where I get confused, I don't know what to do next.
Click here to see answer by stanbon(57984)

Question 140832: Please help!! write the equation of the root
-3/4, 8 thanks for the help.
Click here to see answer by Earlsdon(6294)

Question 140846: please help. write the equation of the root
6,-2/3 thanks for your help
Click here to see answer by jim_thompson5910(28717)

Question 140648: The path of a falling object is given by the function s= -16t^2 +v0t +s0 where v0 represnts the initial velocity in ft/sec and s represents the initial height. The variable t is time in seconds, and s is the height of the object in feet. So if a rock is thrown upward with an initial velocity of 32 ft per second fron the top of a 40-ft building. How high is the rocke after 1 second?after 0.5 seconds? How many sec will it take the rock to reach maximum height before it's downward fall?
Click here to see answer by ankor@dixie-net.com(15747)

Question 140865: helpp!! use the quadratic formula x=-b+(small line under the plus sign) sqrt(b^2-4ac)/2a to find the root of the equation
x^2-4x-6=0 thank you for your help
Click here to see answer by jim_thompson5910(28717)

Question 140786: please help. write the equation of the root
6,-2/3 Thanks for helping.
Click here to see answer by Fombitz(13828)

Question 140885: Hi, I am having a little trouple with my home work. I would be vey grateful if some one could please help me with these two problems.
Solve using the square root property:
(x + 4)2 = 81
Solve by completing the square:
x2 + 6x + 2 = 0

Click here to see answer by stanbon(57984)

Question 140837: Factor the following
x^2+-9+1x
bx^2+-7+-5
x^2+-36
3x^2+11x+4
x^2+8x+7
5x^2+x-18
9x^2+bx-8
26x+x^2-18
Click here to see answer by stanbon(57984)

Question 140896: The number of real roots of the equation 2x4 + 5x2 + 3 = 0 is what

Click here to see answer by scott8148(6628)

Question 140895: The number of real roots of the equation 2x4 + 5x2 + 3 = 0 is
Click here to see answer by scott8148(6628)

Question 140894: please help use the quadratic formula x= -b+ (small dash under plus sign)sqrt (b^2-4ac)/2a find the roots of the equation x^2-4/3x+1/3=0
Click here to see answer by jim_thompson5910(28717)

Question 140900: does this function have a maximum or a minimum?
x^2+4x-5=0
or
(-5,1)
or
(-2,-9)
and what are the coordinates of the vertex in (x,y) form and what is the equation of the line of symmetry on the graph?
Click here to see answer by edjones(7569)

Question 140923: Solving 6x^2+3x-18=0,using quadratic formula. would that be ax^+bx+c=0.
Click here to see answer by checkley77(12569)

Question 140923: Solving 6x^2+3x-18=0,using quadratic formula. would that be ax^+bx+c=0.
Click here to see answer by stanbon(57984)

Question 140933: please help.. using the quadratic formula x=-b+ (small line under the plus sign)sqrt(b^2-4ac)/2a find the roots of the equation
2x^2-3x+1=0 thanks for the help
Click here to see answer by checkley77(12569)

Question 140969: please help. using the quadratic formula x=-b= (with small dash under the plus sign) sqrt (b^2-4ac)/2a find the roots of the equation
6x^2+12x=-5 Thanks
Click here to see answer by Earlsdon(6294)

Question 140977: How would I Factor this equation,if f(t)=2t^2-4t-1,find- with f(2) and f(1).
Do, I replace (t), with 2 and 1 in the equation. And, thanks for the help.
Click here to see answer by scott8148(6628)

Question 140972: please help.. find the root(s) of the equation using the expression x=-b/2a to find each axis of symmetry.then graph each equation .
y=3x^2 thanks so much for your help.
Click here to see answer by stanbon(57984)

Question 140682: need help with these 2 problems.Thanks for all your help.
write the equation of each root
1. 6, -2/3
2. -3/4, -8
Click here to see answer by ankor@dixie-net.com(15747)

Question 140987: Solve the system by graphing. Then graphify the system consistant or inconsistant and as dependent or independent.
5x - 8y = -40
5y - 8x = 40
Will someone please help with this one. It is independent right? And Consistant? Or am I totally wrong if so WHY????
Click here to see answer by jim_thompson5910(28717)

Question 140989: Solve to a solution set.
0.7(9x+9) >_ 2.2-(x+3)
Help with this please, of course the >_ are supossed to be on top of each other. Can somone please help with this.
Click here to see answer by stanbon(57984)

Question 140995: Thank you for your help.Solving the following by Factoring the equations of x^2-6x-16=0, would (x+2)(x-8)=0 or -8x+2x, and would the same apply to 6x^2+42x=0,6x(x+7). Is x2 the same as x^2. This site has truly been a big help for me.
Click here to see answer by edjones(7569)

Question 141026: Hi, I have done this problem in solving equation:
2^2 – x – 1 = 0
This is how I did the problem
Factor the equation: (2x + 1) (x – 1) = 0
Factor separately to equal 0: 2x + 1= 0 x – 1 = 0
2x = -1 x = 1
x = - ½
My question is how to check the answer, and to go back to original equation?
I hope some one can help me please I am not sure about how to go back to the original equation. Thank you very much.

Click here to see answer by stanbon(57984)

Question 141023: How do you graph y<2(x squared)-3x?
Click here to see answer by stanbon(57984)

Question 141031: I want to solve by "completing the square", I have a textbook and some animations but I just do not get it. I had a problem with quadratic formula and I found an example on this website that just made that click for me. I am hoping someone can do the same with "complete the square". Thanks in advance for you explanation.
Click here to see answer by stanbon(57984)

Question 141046: please help...find the root(s) of the equation using the expression x=-b/2a to find the axis of symmetry.then graph.
y=x^2-x-2 thanks
Click here to see answer by smarty1994(10)

Question 141048: 6x^2-8x+2=0
Click here to see answer by vleith(2825)

Question 140936: find the value of the discriminant and give the number of real solutions.
4(x^2+5x)=25
Click here to see answer by nabla(475)

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, 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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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