Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 385519: x^2+9x-12=0
x^2=9x=12
4x^2+36x=12x4
4x^2+36x=48
4x^2+36x+6=48+6

and this is where i get completely confused...i don't even know if I've done the problem right thus far. your suggestions please???
Click here to see answer by stanbon(57219)

Question 385549: help me solve (2x-1)(x-4)=39
Click here to see answer by ewatrrr(10682)

Question 385640: How do i break this problem down step by step to solve for x and to solve for y? 5x-2y=10
Click here to see answer by solver91311(16868)

Question 385671: Twelve less than the square root of a number is the same as 4 times the number. Find the number
Click here to see answer by stanbon(57219)

Question 385546: Hi
Please can someone help
10. If u = ax + by and v = bx - ay, a and b constants, obtain du/dx and dv/dy. By expressing x and y in
terms of u and v, obtain dx/du and dy/dv and deduce that
du/dx.dx/du = a^2/a^2+b^2 and dv/dy.dy/dv = a^2/a2+b2
Thank you very much
Click here to see answer by richard1234(5390)

Question 385827: Solve using the quadratic formula and round your answers to the nearest tenth:
3x^2+4x-2=0

Click here to see answer by mananth(12270)

Question 385853: Find the length of the third side of the right triangle. Assume that c represents the length of the hypotenuse.
b=12, c=15
Click here to see answer by mananth(12270)

Question 385897: write an equation in the form ax^2+bx+c=0 given one root of 5+i
Click here to see answer by robertb(4012)

Question 386074: how do i solve (3x-2)(x-1)=14
Click here to see answer by ewatrrr(10682)

Question 386208: darren can travel 380 miles on 14.2 gallons of gas. how many gallons would he need to travel 500 milies? round to nearest tenth
Click here to see answer by rfer(12644)

Question 386221: how do you solve :
1-2(e-1)=-3-4(3-5)
the answer should be e=7
but i'm just not getting it.
Can you explain step by step please

Click here to see answer by scott8148(6628)

Question 386221: how do you solve :
1-2(e-1)=-3-4(3-5)
the answer should be e=7
but i'm just not getting it.
Can you explain step by step please

Click here to see answer by solver91311(16868)

Question 386261: solve for x in simplest a+bi from x^2+8x+25=0

Click here to see answer by scott8148(6628)

Question 306416: 3d=18-3d d=6
Click here to see answer by fluffy78(1)

Question 386434: Help me simplify: 3(-5-3)+4(7-9)/5(-2)-3(-4)
Click here to see answer by mananth(12270)

Question 386417: please help me slove this question f(x)=x^2+7
i got this but i dont know what to do from here -7+ or - the square root of 85 over 2
Click here to see answer by Alan3354(30959)

Question 386561: how do you graph y=3xsquared - 6x + 7

Click here to see answer by ewatrrr(10682)

Question 386561: how do you graph y=3xsquared - 6x + 7

Click here to see answer by solver91311(16868)

Question 386549: 2gh+v^2=constant
Click here to see answer by Fombitz(13828)

Question 386761: ALGEBRA 1
write in standard from: y+2=4/3(x+6)
Click here to see answer by rfer(12644)

Question 386810: The perimeter of a rectangle is 30m. The length of the rectangle is 3m more than twice the width. Find the dimensions of the rectangle.
Click here to see answer by richard1234(5390)

Question 386809: The perimeter of a rectangle is 98m. The length of the rectangle is 9m more than four times the width. Find the dimensions of the rectangle.
Click here to see answer by richard1234(5390)

Question 386909: solve for F.
Click here to see answer by Alan3354(30959)

Question 386964: how to solve a general solution to a quadratic equation like x power 2 negative 5x+7=0 and thank u
Click here to see answer by mananth(12270)

Question 386970: The width of a rectangle is 3cm less than its length. The rectangle has area of 40cm^2. What is the length of the rectangle?
Please help Im not very good at word problems!!
Click here to see answer by stanbon(57219)

Question 386890: Solve the formula for the specified variable.
Ve=1/2mv^2 solve for v
Click here to see answer by Fombitz(13828)

Question 387036: What is the solution to the equations represented by these two lines f(x)=(3/2)x and g(x)=(-1/2)x+4
Click here to see answer by Fombitz(13828)

Question 387036: What is the solution to the equations represented by these two lines f(x)=(3/2)x and g(x)=(-1/2)x+4
Click here to see answer by Alan3354(30959)

Question 387089: find the discriminant: x^2+4=5x
Click here to see answer by ewatrrr(10682)

Question 387088: solve : 5y^2+27=2y^2
Click here to see answer by ewatrrr(10682)

Question 387083: solve the quadratic equation by factoring: 15x^2-2x-8=0
Click here to see answer by ewatrrr(10682)

Question 387096: Divide 4 1/5 by 3 1/7 Write the result in simplest form. I must show the work and I do not know how to reduce to simplest form.
Click here to see answer by edjones(7569)

Question 387077: how do i solve this quadratic function so i can then graph it? y=(x+3) (x-2)
Click here to see answer by stanbon(57219)

Question 387077: how do i solve this quadratic function so i can then graph it? y=(x+3) (x-2)
Click here to see answer by tara0066(31)

Question 386829: (-2,16)(0,4)(4,28) make into standard form using parabola
Click here to see answer by ankor@dixie-net.com(15624)

Question 387132: what is 3a2 + 9 equal when factoring

Click here to see answer by stanbon(57219)

Question 387209: y=x2+4x+3 Graph using Quadratic Equation. I have a calculator but I really don't know how to use it well. I know how to go to the Y= screen. How do you set this up and graph it.

I have one more question, Question Solve with the slope-intercept form of equation (-7,7) and(0,-3).
this is what I got.
(-7,7) (0,-3)
m=7-3/0-7
=4/-7=4/7
y=(4/7)x+b
using (0,-3) to solve for b
-3=b
y=(4/7)x-3 my answer
Click here to see answer by rfer(12644)

Question 387217: Which of the numbers 21, 88, 126, and 255 are divisible by 7?
Click here to see answer by Alan3354(30959)

Question 387207: I came across a word problem type of quadratic equation that I am having a hint of trouble understanding.
problem: every root of x^2-5x-6=0 is one greater than a root of x^2+px+q=0.
What does p equal?

What I did was, I found the factors of x^2-5x-6=0
I received x = -1, 6 as the factors.
But what does it mean by root and greater? I am confused after this part of the question. WOuld the answer be
0, 7?
Click here to see answer by jim_thompson5910(28476)

Question 387256: y=x2+4x+3 Graph using Quadratic Equation. I have a calculator but I really don't know how to use it well. I know how to go to the Y= screen. How do you set this up and graph it.
Click here to see answer by jim_thompson5910(28476)

Question 387325: Solve by factoring:
x2 + 2x = 8

Click here to see answer by edjones(7569)

Question 387374: Solve the quadratic equation: x^2-2x-4=-x^2+7x+1
Click here to see answer by nerdybill(6948)

Question 387378: the perimiter of a right triangle is 12. the lengths of the legs of the triangle are 3 and x. the length of the hypotenuse is y.
how can i set up a system of equation that could be used to find the hypotenuse and the other of the right triangle?

Click here to see answer by stanbon(57219)

Question 387436: Given the quadratic function f(x) = 9x^2 + 36x + 36, find a value of x such that f(x) = 9. Can you please show the work too?
Thanks in advance!
Click here to see answer by ewatrrr(10682)

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