Answer
$-12a^{6}c^{8}$
Work Step by Step
Multiply the coefficients : $-12c^{4}ac^{3}a^{5}c$
This is equivalent to : $-12aa^{5}c^{4}c^{3}c$
This becomes : $-12a^{1+5}c^{4+3+1}$ , since exponents are added while multiplying with the same base
Final result : $-12a^{6}c^{8}$
