Answer:
20480x^18
Explanation:
first of all, solve 5(x^3)^2
(x^3)^2 means 3x2=6, so x^6. 5 times x^6 = 5x^6
(16x^4)^-3 = 1/4096x^-12
when theres a negative in exponent, make it 1/y.
when negative exponent appears in 1/y just flip it again to make it y. So...
5x^6 ( 4096x^12) = 20480x^18
hope this helps.