Consider the expression logbase5 a=n

Question

a) For what value(s) of a will n be a positive number?
b) For what value(s) of a will n be a negative number?
c) For what value(s) of a will n be undefined?

Answer 1

5^n > 1 if n>0
5^n < 1 if n<0
log is undefined for a <= 0