Question

Subtract 7a²b-4a²b² +9 from 4a²b + 5a²b² +9

Answer 1

$4a²b + 5a²b² +9 - (7a²b-4a²b² +9) \\ 4a²b + 5a²b² +9 - 7a²b + 4a²b² - 9$

By adding,we get

$- 3 {a}^{2} b + 9 {a}^{2} {b}^{2}$

Hope this will be helpful..

Answer 2

When we subtact in Algebra, the sign is changed

I hope it helps u