Chapter 5 - Section 5.2 - Negative Exponents and Scientific Notation - Exercise Set - Page 354: 57

$\dfrac{7ab^{-4}}{7^{-1}a^{-3}b^{2}}=\dfrac{49a^{4}}{b^{6}}$

$\dfrac{7ab^{-4}}{7^{-1}a^{-3}b^{2}}$ Evaluate the division: $\dfrac{7ab^{-4}}{7^{-1}a^{-3}b^{2}}=7^{1-(-1)}a^{1-(-3)}b^{-4-2}=7^{2}a^{4}b^{-6}=...$ Simplify: $...=49a^{4}b^{-6}=\dfrac{49a^{4}}{b^{6}}$