# How do you factor completely #x^2 + 2x – 15#?

##### 1 Answer

Mar 2, 2018

#### Answer:

See below...

#### Explanation:

To factorise, we firstly need two brackets, each containing an

This creates the

Now we need to get the rest of the terms. To do this, we need two factors of

The two factors that do this are

You can check by expanding it out.

When looking for factors, if it is not obvious straight away then list them out and you'll eventually get there.