Question

Resolva a equação incompleta 7a²-63=0

Answer 1

7a²=63
a²=63/7
a²=9
a=√9
a=-3 e +3

Answer 2

7a²-63=0
$7a^{2} =63$
$a^{2} = \frac{63}{7}$
$a^{2} =9$
a=3