# How do you factor the expression #x^2-3x-10#?

##### 1 Answer

Mar 31, 2016

(x + 2)(x - 5)

#### Explanation:

Find a factor pair of (-10), that has a sum of (-3).

The pair numbers have opposite signs because ac < 0.

Factor pair of (-10) --> (2, -5). This sum is - 3 = b.

Then, the 2 numbers are: 2 and -5.

y = (x + 2)(x - 5)