Hey guys!

I have been trying to figure out this problem all day and no matter what I do I keep coming to the same answer which I have been assure is incorrect. The Question is to simplify:

((a^2*c^-2)/(b^3)) * ((b^4*c^3)/(a^3*b^2))^2

This is my working:

((a^2*c^-2)/(b^3)) * ((b^8*c^6)/(a^6*b^4))

which results in:

((a^2*c^4*b^8)/(a^6 * b^7))

A point in the right direction would be great, peace guys