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# gcse maths watch

1. How would you factorise x^(2) + 16x + 40.
2. completing the square maybe
3. surely you can complete the square with (x 8)^2 - 24 ?
4. (Original post by guys014)
surely you can complete the square with (x 8)^2 - 24 ?
Oh right. I thought it would be harder as its a 3 mark question.
5. (Original post by Maths1210)
Oh right. I thought it would be harder as its a 3 mark question.
if its a 3 mark question then you probably just need to write out the steps clearly so
x^2+16x+40
16/2 = 8
8^2=64
64-40=24
(x+8)^2 - 24

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