1. Given , find r.

 

 

 

We can change the radical symbol notation to exponential notation, remembering that a root is expressed as a fractional exponent.

 

 

Changing everything to powers of 2:

 

 

When dividing powers of the same base, we subtract the exponent of the denominator from the exponent of the numerator.

 

 

If the bases are the same on each side of the equation, the exponents are equivalent, so