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Hollyann · Answer 1 · 2017-04-17T18:23:02+0000

This graph is a parabola. Therefore, the point of symmetry occurs at the x where f'(x)=0. From this we can find the axis of symmetry:

$f(x)=-5x^2-20x-10\\f'(x)=-10x-20=0\\-10(x+2)=0\\x+2=0\\x=-2$

The axis of symmetry is x = 2.

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