Expand and simplify .
The power is 5 so we will need the 5th row of Pascal's triangle for the coefficients
(You are not expected to remember this, but are expected to be able to write out Pascal's triangle to work out the fifth row)
If unsure expand using first, so you can check the powers in each term add up to 5
Use and
Identify that and
Applying the basic index laws and substituting for a and b means we can start writing down the expansion
Be careful with negatives - use brackets around that -2
Remember to apply the power to each value/letter inside the bracket where necessary
Evaluate where possible, again being careful with negatives
If expanded correctly, nothing else should simplify at this stage, but double check negatives alternate, powers of x start at 5, descend to 1 and that there is a constant term