sorry on i seei have atypo in the original post the exponent should be -3 so it should read as such
(2ab)^-2/2(ab)^-3
But with the equation at the top where does the 2^-1 come from if it was 2^3? The rest i can understand.
Sorry for the typo.
It's all right. For the equation I posted, you have 2(ab)^3 for the denominator. Using the law of operations the power of 3 only applies to a and b, not on the 2.