Factor completely x2 + 20x - 36.

Group of answer choices

(x - 2) (x - 18)

(x + 2) (x - 18)

(x - 2) (x + 18)

Prime

Prime

Step-by-step explanation:

x² + 20x - 36

You must find a pair of numbers that multiply to give - 36 and add to give + 20.

The likely candidates are 2 and 18, and they must have opposite signs to give a negative product.

+2 * (-18) = - 36; + 2 + (-18) = - 16

-2 * 18 = - 36; - 2 + 8 = + 16

Neither combination gives + 20 as the sum.

The expression can't be factored with rational numbers.

The expression is prime.