Question 959201
I get this from your statement of the problem
( (-4a)^2 )^6 / 2a^5b^4 = (16a^2)^6 / 2a^5b^4 = 16^6a^12 / 2a^5b^4 = 16777216a^12 / 2a^5b^4 = 8388608a^7 / b^4