Is This Correct? The Derivative of X3^(x+1) is X3^x+1*ln x3?

Question

I used this rule: d/dx a^x = a^x (ln a).

Answer 1

If X3 is a number (not a function of x), then yes, you are correct.
(I am certain your answer is to be read as X3^(x+1) ln X3)