## Precalculus (6th Edition) Blitzer

$\frac{1}{4}$
Start with given expression: $2^{-3}\times2$ Use product rule to simplify: $2^{-3}\times2^{1}=2^{-2}$ Use negative exponent rule to simplify further: $\frac{1}{2^{2}}=\frac{1}{4}$