Question

Select the equivalent expression:

Please explain why it is changed from a fraction to a multiplication problem!

Answer 1

On opening the bracket, we have (x^-28)/(x^56)

This is the same as (x^-28) . 1 / (x^56)

Following the law of indices 1/(x^a) = x^-a, we have 1 / (x^56) = (x^-56)

Hence (x^-28) . (x^-56)