# How do you factor the expression #x^2-x-42#?

##### 2 Answers

Mar 22, 2018

#### Explanation:

Mar 22, 2018

#### Explanation:

The coefficient of

We are looking for an

Possible factors for

The sum has to equal -1.

We can see that the only factors with a sum of

These are the required values:

Expanding:

As required.

With practice you will quickly find the required values without having to list them all.