Question

12a-7b-(4a-21b)

Answer 1

how do i do this?

Answer 2

First eliminate the parenthesis by using the distributive property. Multiply each part in the parenthesis by -1. This would give you 12a - 7b - 4a + 21b. Now, combine like terms. 12a - 4a = 8a, -7b + 21b = 14b, leaving you with 8a + 14b as your answer.