Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 106817: Hello, could you please help me with this factoring equation?
x^3-9x+x^2-9 I am supposed to factor this completely. I tried many different combinations, none of which work. How do I figure this one out? Thank you, Paul
Click here to see answer by ankor@dixie-net.com(15656)

Question 106861: I did what I was supposed to do on this equation, but my answers did not check out. 2/x+5/2x=1. How do you solve this problem? Thank you.
Click here to see answer by checkley75(3666)

Question 106860: solving quadratic equations by extracting square roots.
(x-2/5)^2=49/25 is the problem i am having trouble with.
i did try to do it. i can't show the root sign to you with my computer
to show what i did.

Click here to see answer by Earlsdon(6287)

Question 106948: a 48 cm wire is to be cut into two pieces. One piece must be 10 cm longer than the shorter piece. How long should each piece be?
Click here to see answer by cheesey(22)

Question 106960: solve for r: A="pie"r"squared"
Click here to see answer by cheesey(22)

Question 106914: I don't know what this one is asking.. sqrt(3a^7) The question says simplify, simplify what? Thank you, Rita
Click here to see answer by checkley75(3666)

Question 107014: When I get to Factoring 40 I can not get anything to add to get 22. How would I work the problem out?
Click here to see answer by checkley75(3666)

Question 106934: find the quadratic function, whose graph passes through the points (1,3),(-2,18) and (3,13)
Click here to see answer by scott8148(6628)

Question 106963: please help me answer this question: use the axis of symmetry formula to find the vertex of f(x)=3x^2-4x+1.
Click here to see answer by scott8148(6628)

Question 107031: Hi, please help me answer this problem:
The height in feet of a golf ball hit from an elevated tee box is given by h(t)=-16t^2+60t=25 where t represents the time in seconds the ball is in flight.
a.) Determine the number of seconds before the golf ball hits the ground at a height level of 0 feet.
b.) Determine the time interval that the ball is above 25 feet.
Thanks.
Click here to see answer by scott8148(6628)

Question 107035: Hey,
Please help me solve this problem:
A square mat used for athletic exercises has a uniform red border on all four sides. The rest of the mat is blue. The width of the blue square is three-fourths the width of the entire square. If the area colored red is 28 m^2, determine the length of each side of the mat.
Thanks!
Click here to see answer by scott8148(6628)

Question 107050: i need help solving these quadratic equations using the quadratic formula.
2x^2 - 5x = 3
Click here to see answer by jim_thompson5910(28595)

Question 107049: i need help solving these quadratic equations using the quadratic formula.
2x^2 - 5x = 3
3x^2 - 2x + 1 = 0
i am trying to solve for x
2(x-5)^2 = 3
and this queston also i have been trying to figure these out fo an hour.
x^2 + 4x + 4 = 7

Click here to see answer by edjones(7569)

Question 107036: Hi,
Please help me solve this problem:
The formula for computing the amount A of an investment of principal P invested at interest rate r for 1 year and compounded semiannually is A=P(1+r/2)^2. Approximately what interest rate is necessary for $1,000 to grow to $1,075 in 1 year if the interest is compounded semiannually?
Thank you!
Click here to see answer by edjones(7569)

Question 107047: i need help solving these quadratic equations using the quadratic formula.
2x^2 - 5x = 3
3x^2 - 2x + 1 = 0
i am trying to solve for x
2(x-5)^2 = 3
and this queston also i have been trying to figure these out fo an hour.
x^2 + 4x + 4 = 7
Click here to see answer by Annabelle1(69)

Question 79298: Solve
x^2 - 5x = 14
Click here to see answer by HyperBrain(694)

Question 107033: Hi, please help me answer this question:
The president of a company producing water pumps has gathered data suggesting that the average cost in dollars producing x units per hour of a new style of pump will be C(x)=x^2-22x+166. Determine the number of pumps per hour to produce to keep the average cost below $75 per pump.
Thanks!
Click here to see answer by Annabelle1(69)

Question 107171: Draw a rough sketch of the quadradic function. Label the vertex and any x and y intercepts.
f(x)=-2(x-3)2+8 (that is (x-3) squared)
Click here to see answer by stanbon(57361)

Question 107173: i need some help with these i am trying to solve these by quadratic equation formula and these are the answer that i came up with.
(x - 1)^2 = 7
i am getting 1 +- sqrt 7
x^2 - 9x - 4 = 6
i get -1 and a 10
4x^2 - 8x + 3 = 5
i am getting 2 +-sqrt 6/2

Click here to see answer by MathLover1(6634)

Question 107154: i am asking for help for a worded quadratic equation.the lenght of a rectangle is 5cm more than its width and the areais 24cm square find the length and the width of triangle.i really need help with this equation i am wondering if i could get the working out thank u
Click here to see answer by scott8148(6628)

Question 107158: I can't seem to set it up right to get the answer? Larry Drove 329 miles in 2hrs more than it took Terrell to drive 260 miles. Terell drove at an average of 5 miles per hour faster than Larry. How fast did Larry travel. Please Help.
Click here to see answer by scott8148(6628)

Question 107275: what is the null factor law?
Click here to see answer by MathLover1(6634)

Question 107287: Please help me solve this problem: Find two consecutive positive integers such that the sum of their sraures is 85.
Click here to see answer by Annabelle1(69)

Question 107282: I cannot get anywhere with this problem, please help.
Find two consecutive positive integers such that the sum of their squares is 85.
Click here to see answer by MathLover1(6634)

Question 107371: I need help with this kind of problem:
Find the vertex, the y-intercept, and symmetric point, and use these to sketch a graph.
y=2x^2 -11x -12
I am having problems solving for the vertex.
Click here to see answer by Annabelle1(69)

Question 107433: f(x)=x^3-5 i need help with the steps solving this problem for graphing thanks for the help
Click here to see answer by Annabelle1(69)

Question 107509: x^2-4-0 , 3x+x^2=0, x^2-10x+2=0 , 4x^2-16x=-16
Click here to see answer by solver91311(16897)

Question 107515: solve by vertex form :
y = x^2+6x-12
y = 4x^2-24x-11
Click here to see answer by stanbon(57361)

Question 107572: c=5/9(f-32) need to isolate for f
Click here to see answer by checkley71(8403)

Question 107572: c=5/9(f-32) need to isolate for f
Click here to see answer by bucky(2189)

Question 107641: 3(x-2)²=21
Click here to see answer by jim_thompson5910(28595)

Question 107630: The time =f(x), in seconds, for a free falling object to fall, x ft is modeled by f(x) = square root of x/16. Worker drops hammer from a building and it hits ground after 4 seconds, what is ht. hammer dropped from?
You have helped me before and I really thank you!! I have solved a few on my own, just really stuck this time. Thanks again!!!
Click here to see answer by scott8148(6628)

Question 107677: I have a fence wire 100M long nad wish to fence a rectangular piece of land on three sided ONLY. What is the maximum area I can fence and also the length and width. Please confirm the solution is correct. Thank you.
Lenght =x
Width = y
x+2y=100
x= 100-2y
Area = xy = (100-2y)y
-2y^2+100y
Completing squares
-2(y-25)^2-(25x25)
This is the vertex form and gives us the x intercept.
That is the width is 25 and hence length is 50
Area is 1250
Is the answer correct.

Click here to see answer by stanbon(57361)

Question 107729: 3(2-6)= 2x-1(4+3)
Click here to see answer by stanbon(57361)

Question 107616: Hi wondering if anyone can help, can someone explain to me symmetric functions
of the roots. I have this equation , and this question .

Many thanks
Tom
Click here to see answer by vertciel(183)

Question 107772: I was wondering if you could help me. I don't think this problem is in this particular book,it is off of a webassign.net section 6.6 but I don't know anywhere else to look. I have this problem 5.5(x-9.5)(x+4.5)(x-3.2) and I'm suppossed to put it in general form, I think some call it polynomial form. I have tried it a hundred different ways and I come up with 5.5x^3-451/10x^2-147.125x+752.4 and 5.5x^3-45.1x^2-147.125+752 everytime I submit this it tells me I'm wrong what else do I do to get it in the form ax^2+bx+c Thanks for any help you can give
Click here to see answer by scott8148(6628)

Question 107830: I need to solve the following quadratic equation using the quadratic formula and I am just not getting it. Please show me the steps. Thank you.
3x^-x-1=0
Click here to see answer by jim_thompson5910(28595)

Question 107967: solve the equation by completing the square

Click here to see answer by jim_thompson5910(28595)

Question 107967: solve the equation by completing the square

Click here to see answer by MathLover1(6634)

Question 108006: Im just reviewing math test that's coming in 2 weeks and I dont understand any of it. When you solve can you show me how you got the following answers?
5-2x=3x-7x=25
5(d+4)=7(d-2)
3g-3=3(7-g)
2z-1=4+z
Click here to see answer by jim_thompson5910(28595)

Question 108100: use quadratic formula to solve equation
0=x^2+x-20
Click here to see answer by checkley71(8403)

Question 108099: 0=x^2=x-20
Click here to see answer by checkley71(8403)

Question 108264: 5-2x=3x-7x+25
5(d+4)=7(d-2)
3g-3=3(7-g)

I really just dont understand equation with both sides. So explain CLEARLY please.
Click here to see answer by stanbon(57361)

Question 108276: Can someone please help me with this problem??
A revenue function is R(x)= 22x and a cost function is C(x)=-9x+341. The break even point is____?
Click here to see answer by stanbon(57361)

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