Question

Ali was asked to simplify the expression 3(x - 6) + (4x + 12) - 6x. His work is shown below.

3(x - 6) + (4x + 12) - 6x

3x - 9 + 4x + 12 - 6x

(3x + 4x - 6x) + (-9 + 12)

x + 3

Answer 1

Step 2 is wrong.

It should be 3x – 18 + 4x + 12 – 6x

Step-by-step explanation:

3(x – 6) + (4x + 12) – 6x →

3x – 18 + 4x + 12 – 6x →

(3x + 4x – 6x) + (-18 + 12) →

x – 6