Hi,

the vertex form of a parabola,  where(h,k) is the vertex

f(x)= -4(x+7)^2+8   V(-7,8) a maximum, parabola opens downward a = -4 a <0

                   Line of symmetry is x = -7

 

f(x)= -(x+6)^2-7   V(-6,-7) a maximum, parabola opens downward a = -1 a <0

                   Line of symmetry is x = -6











 

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