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05-05-2017
Mathematics

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find the vertex of this parabola
y=-x^2+8x-25

Respuesta :

05-05-2017

dy/dx=-2x+8

dy/dx=0 when -2x+8=0, 2x=8, x=4

y(4)=-16+32-25=-9

So the vertex is (4,-9)

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