Write x2+8x+13x^2 + 8x + 13x2+8x+13 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=x2+8x+13y = x^2 + 8x + 13y=x2+8x+13
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