Question

5a- { - 2a²+ [b²-3a- (a²+b²) + (-a-3b²]} me ajudem galera

Answer 1

5a-{-2a²+[b²-3a-(a²+b²)+(-a-3b²)]}
5a-{-2a²+[b²-3a-a²-b²-a-3b²]}
5a-{-2a²+b²-3a-a²-b²-a-3b²}
5a+2a²-b²+3a+a²+b²+a+3b²=
9a+3a²+3b², colocando em evidencia o 3(3a+a²+b²)