Question

1. (3a + 4b) + (6a - 6b) =

Explanation:

Step1: Remove parentheses

$3a + 4b + 6a - 6b$

Step2: Combine like terms for $a$

$3a + 6a = 9a$

Step3: Combine like terms for $b$

$4b - 6b = -2b$

Step4: Combine results

$9a - 2b$

Answer:

$9a - 2b$