(x2 y-1)2 (Simplify answer should contain only positive exponents)
Power to a power you times the powers
(x2y-1)2 = x2*2y-1*2 = x4y-2
When a value is to a negative power it is the same as 1 / that number to the positive power
x4y-2 = x4(1/y2) = x4 / y2
