Use the rule:

 is equivalent to .

 is equivalent to 

.

We want to make the exponent of a become 1.  To do that we raise
both sides to the  power, the reciprocal of the power
to which a is now raised to:



Multiply those exponents and get a to the 1 power:



That's technically the answer but we need to simplify it:
We write 25 as .



We write  as 



Multiply those exponents:  





Edwin