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I am confused on how you complete the square and also how you would answer a questions which has a shape but asks for a quadratic equation.
This might help you: http://www.bbc.co.uk/schools/gcsebitesize/maths/algebra/quadequationshirev2.shtml
I am not sure about the shape bit, but I have a resource about completing the square I uploaded.
Its a scan so it a little wonky, but you can still see it. You may have this book already, so i hope I didn't waste your time. Feel free to comment on my resource. Hope it helps.
This video might help