(16x^8)^-1/4=
When the exponent is -1/4, the negative sign flips the problem into the denominator
(16x8)-1/4 = 1 / [ (16x8)1/4 ]
The exponent of 1/4 means to take the fourth root:
161/4 = 2 and (x8)1/4 = x2
= 1 / ( 2x2 )
