https://filestore.aqa.org.uk/resources/english/AQA-87022-SQP.PDF - the sample paper where both poems can be fo...
We have X2 - 4X = 5, write the expression on the left side as X2 - 2•2X = 5. Then we would need extra term 4 to complete the square, so adding 4 on the both sides gives us, X2