Question

How do you factor completely `5x^2-10x-15`?

Answer 1

`5x^2-10x-15=5(x+1)(x-3)`

Explanation:

`5x^2-10x-15`

Factor out the GCF 5.

`5(x^2-2x-3`)

Factor `(x^2-2x-3)`. (Keep the `5`.)

`5(x+1)(x-3)`