Question

please tell this answer i only conform that my answer is right or not

Answer 1

since base is same we will add the power
a^3x-7+2x-9-x
a^4x-16

Answer 2

a^3x-7 × a^2x-9 × a^-x
(a)^3x-7+2x-9+(-x)
a^5x-16-x
a^4x-16