We have to be able to simplify expressions of the formand
We
must be clear about the rules for indices and cancelling fractions.
The first one is simplified as follows:
The second expression factorises on the top and bottom:
is
a common factor hence we can cancel it to give the answer:
We may also have to simplify by adding fraction which result in
terms to cancel:
The numerator factorises and we can identify common factors in
numerator and denominator.
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