Question

What is the solution to the equation 14 ^ (x + 3) = 21?

Answer 1

The answer to your question is b

Answer 2

$\bf 14^{x+3}=21\implies log(14^{x+3})=log(21)\implies (x+3)log(14)=log(21) \\\\\\ x+3=\cfrac{log(21)}{log(14)}\implies x=\cfrac{log(21)}{log(14)}-3$

and surely you'd know what that is.