Question

expression: 7 - 3(4 - 2x) - 10x
step 1: 7 - 3(4 - 2x) - 10x
step 2: 4(4 - 2x) - 10x
explain why step 2 is wrong

Answer 1

Answer:

Because first you need to multiply each number/variable with 3, parenthesis always go first.

3(4-2x) = 12 - 6x