SOLUTION: How do you set up the problem for (x+4)(x-9)=4x, I know that I need to subtract 4x from each side to set the problem to 0 but I do not know what to do after that. Do I distribute

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equation Customizable Word Problems -> SOLUTION: How do you set up the problem for (x+4)(x-9)=4x, I know that I need to subtract 4x from each side to set the problem to 0 but I do not know what to do after that. Do I distribute       Log On


   

Question 786200: How do you set up the problem for (x+4)(x-9)=4x, I know that I need to subtract 4x from each side to set the problem to 0 but I do not know what to do after that. Do I distribute the -4x to (x+4) and then factor out the - and then solve for x?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
set up the problem for
(x+4)(x-9)=4x
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x^2-5x-36 = 4x
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x^2 - 9x -36 = 0
Factor:
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(x-12)(x+3) = 0
x = 12 or x = -3
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Cheers,
Stan H.