antiderivate question

[tmt]

for ∫a^x dx,

is the answer a^x/ln a or a^x/ln|a| or does it matter?

Thanks

 

[ThePerfectHacker]

The function $a^x$ is not defined for negative values of $a$. If $a>0$ and $a\not = 1$ then what you wrote is correct without absolute values.