Write x2+6x−7x^2 + 6x - 7x2+6x−7 in the form (x+a)2+b(x + a)^2 + b(x+a)2+b where a a\,a and b b\,b are integers.
Hence, or otherwise, write down the coordinates of the turning point of the graph of y=x2+6x−7y = x^2 + 6x - 7y=x2+6x−7
