Question

(8-9а)а= -40+(6-3а)(6+3а)

Answer 1

8a-9a²=-40+36-9a²
8a-9a²+9a²=-4
8a=-4
a=-1/2

Answer 2

8а-9а2=-40+36+18а-18а-9а2 -9а2+9а2+8а-18а+18а=-40 8а=-40 а=-40:8 а=-5