Hi,

f(x)=x^2+8x+7 = (x+4)^2 - 16 + 7 = (x+4)^2 -9

f(x)= 1(x+4)^2 -9  Parabola opening Upward 1 > 0, V(-4,-9)

Lineof Symmetry x = -4, P(0,7)& (-8,7) on Parabola



 

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