Question

Resolva a equação $7^{x+3} =1$

a   x = -1
 b  x = 0
 c x = -2
d  x = -3
 e x = -4

Answer 1

$7^{ x+3 }=1\\ 7^{ x+3 }=7^{ 0 }\\ x+3=0\\ x=-3$