Write 3x2+18x+213x^2 + 18x + 213x2+18x+21 in the form a(x+b)2+ca(x + b)^2 + ca(x+b)2+c where aaa, bbb, and c c\,c are integers.
Hence, or otherwise, write down the coordinates of the turning point of the graph of y=3x2+18x+21y = 3x^2 + 18x + 21y=3x2+18x+21
Practise Edexcel GCSE Maths Completing the Square with exam-style questions for Foundation and Higher tier. 56 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.