## Algebra: A Combined Approach (4th Edition)

$-27$
Step 1: $-9^{\frac{3}{2}}$ Step 2: $(-3^{2})^{\frac{3}{2}}$ Step 3: Simplifying exponents, $2\times\frac{3}{2}=3$ Step 4: The expression now becomes $(-3^{3})$ or $-27$