SOLUTION: Factor using u-substitution. {{{(x^2-3x)^2-38(x^2-3x)-80}}}

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Factor using u-substitution. {{{(x^2-3x)^2-38(x^2-3x)-80}}}      Log On


   

Question 1107533: Factor using u-substitution.
%28x%5E2-3x%29%5E2-38%28x%5E2-3x%29-80
Found 2 solutions by josgarithmetic, TeachMath:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Let x^2-3x=u..

Now the expression is u%5E2-38u-80.

%28u-40%29%28u%2B2%29

Put back the substituted expression part.
%28x%5E2-3x-40%29%28x%5E2-3x%2B2%29
(not finished)

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Answer by TeachMath(96) About Me  (Show Source):
You can put this solution on YOUR website!

correct answer: (x - 8)(x + 5)(x – 2)(x – 1)