take each variable or constant step by step...
(-5)^3 * (a^3)^3 * (b^-2)^3
if there are 2 exponents they get multiplied...
and for (-5)^3 multiply -5 thrice by itself..
so it becomes -125a^9 b^-6
yes....or you can even write 64^-1
since the sign changes when u make it a reciprocal(when numerator becomes denomerator or denominaator becomes numerator..)