Question

factor the expression completely.
$21x - 27$

Explanation:

Step1: Find GCD of 21 and 27

The greatest common divisor (GCD) of 21 and 27 is 3.

Step2: Factor out the GCD

Divide each term by 3 and factor it out:
$21x - 27 = 3(7x - 9)$

Answer:

$3(7x - 9)$