# How do you factor #8x^2 - 4x - 24#?

##### 2 Answers

Well, you can factor out 4 immediately:

You can work out that the further factorization will look something like:

and

so you know that

and

You know that either a or b must be negative, and the other number must be positive.

At this point, I usually resort to trial and error guessing. There are usually a couple of choices, so try one, then the other.

so what if

...good guess. So your factorization will be:

#### Explanation:

First take out the common factor of

Find factors of