# Question #6d4f8

Nov 4, 2016

You get $\left(a - 2\right) \left(a + 1\right)$

#### Explanation:

We need two numbers to multiply to -2, and to add up to -1. Through trial and error, we can find out that these two numbers are -2 and 1.

$- 2 \times 1 = - 2$
$- 2 + 1 = - 1$

Since $a$ does not have a coefficient, in the answer it will just remain as $a$.

Using -2 and 1 we get:

$\left(a - 2\right) \left(a + 1\right)$