## Precalculus (6th Edition) Blitzer

$-5a^{11}b$
Start with given expression: $\frac{25a^{13}b^{4}}{-5a^{2}b^{3}}$ Separate fractions with like terms: $\frac{25}{-5}\times\frac{a^{13}}{a^{2}}\times\frac{b^{4}}{b^{3}}$ Divide and use quotient rule on fractions: $-5a^{11}b$