sherlynl sherlynl

23-10-2019
Mathematics

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Find the axis of symmetry and the vertex of the graph of f(x) = -5x^2 +20x -9.

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danran4secretaryusa danran4secretaryusa

23-10-2019

Answer:

Axis of Symmetry:

x=2

Vertex:

(2,11)

Step-by-step explanation:

Finding the derivative:

f'(x)=-10x+20

Setting the slope equal to zero:

-10x+20=0 x-2=0 x=2

Finding vertex:

f(2)=-5*(2)^2+20*2-9

=-20+40-9=20-9=11

(2,11)

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