Asked by Anonymous

How do I find a factor of x^3 - 3x^2 - 28x?
Answered by Reiny
first notice the common factor of x

x^3 - 3x^2 - 28x
= x(x^2 - 3x - 28)
now do the quadratic
= x(x-7)(x+4)

(notice (-7)(+4) = -28 and -7+4 = -3 )
Answered by Anonymous
So x - 7 is a factor?
Answered by Reiny
Didn't I just show you that it was ?
Did you not look at my answer ?
Answered by Anonymous
Yes, I saw your answer. I was just confirming :).
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