## anonymous one year ago simplify the expression

1. anonymous

$\frac{ -18a ^{-8} b ^{-3}}{ 6a ^{-2}b ^{-7} }$

2. anonymous

3. anonymous

the rule is to simplify exponents of the same base (a or b), in that the fraction indicates a minus sign between the exponents and a multiplication indicates a plus. For example, consider a: -8 -(-2)=-6. For the same reason, consider b: -2 -(-7)=5. here it is the final simplification $-{ a^{-6} b^{5} }$

4. anonymous

a9 ———— 2b12