Posted by **ted** on Thursday, July 5, 2012 at 4:50pm.

How do you factor X^3+5x^2-28x-32?

pls help

- math -
**Reiny**, Thursday, July 5, 2012 at 6:24pm
let f(x) = x^3 + 5x^2 - 28x - 32

I tried x = ±1, ±2, ±4 (that is, factors of 32)

on the second try, I found f(-1) = 0

so x+1) is a factor

Using synthetic division I found

x^3 + 5x^2 - 28x - 32 = (x+1)(x^2 + 4x -32) which factored again to

(x+1)(x+8)(x-4)

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