## Elementary Algebra

-$\frac{2}{9}$$a^{2}$$b^{5}$
(-$\frac{7}{12}$$a^{2}b)(\frac{8}{21}$$b^{4}$) = Use the exponent rule to simplify: $b^{n}$ $b^{m}$ = $b^{m+n}$ -$\frac{7}{12}$ $\times$ $\frac{8}{21}$ $\times$ $a^{2}$ $\times$ $b^{1+4}$ = -$\frac{2}{9}$ $\times$ $a^{2}$ $\times$ $b^{5}$ = -$\frac{2}{9}$$a^{2}$$b^{5}$