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

Question 1107533: Factor using u-substitution.

Found 2 solutions by josgarithmetic, TeachMath:
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
Let x^2-3x=u..

Now the expression is .

Put back the substituted expression part.

(not finished)

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

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