Question

Find the difference (ab+4a-6) - (ab-6)

Answer 1

(ab + 4a - 6) - (ab - 6) = ab + 4a - 6 - ab + 6 = (ab - ab) + (6 - 6) + 4a = 4a

Answer 2

((ab + 4a - 6 )) - ((ab-- 6)) = ab + 4a - 6 - ab   +  6= 4a