Question

(a²-4a²)+(2ab+3ab)+(-b²+7b²)

Answer 1

(a²-4a²)+(2ab+3ab)+(-b²+7b²)=-3a²+5ab+6b²

Answer 2

(-3a^2)+((2+3)ab)-b-7b^2
-3a^2+(5ab)-b-7b^2
-3a^2+5ab-b-7b^2