Posted by lizzie on .
Please explain
One factor of x3 + 5x2 + 2x  8 is (x + 4). Find the remaining factors.

Algebra 
Reiny,
perform either synthetic division or long algebraic division of
(x^3 + 5x^2 + 2x  8) by (x+4) to get
(x^3 + 5x^2 + 2x  8) = (x+4)(x^2 + x  2)
I will leave it up to your to further factor the quadratic, it comes apart very easily.