Question

How do you factor `5x^3+4x^2-10x-8` by grouping?

Answer 1

`(x^2-2)(5x+4)`

Explanation:

Let `p(x)=5x^3+4x^2-10x-8`

`=ul(5x^3-10x)+ul(4x^2-8)`

`=5x(x^2-2)+4(x^2-2)`

`=(x^2-2)(5x+4)`