how do solve 256^-3/4
= 1 / ( 256^(1/4) )^3 = 1/ (4)^3 = 1/64
\(256^{\frac{-3}{4}}\\ =(\sqrt[4]{256})^{-3}\\ =\sqrt[4]{4^4}^{-3}\\ = 4^{-3}\\ =\dfrac{1}{4^3}\\ =\dfrac{1}{64}\)
