Rewrite the expression using the negative exponent rule .

Rewrite the expression using the negative exponent rule .

Multiply and .

Change the sign of the exponent by rewriting the base as its reciprocal.

Apply the product rule to .

Apply the power rule and multiply exponents, .

Multiply by .

Apply the power rule and multiply exponents, .

Multiply by .

Simplify (a^-5c^-9)^-4