Posted by **sam** on Sunday, July 11, 2010 at 7:15pm.

Find the line of symmetry, the maximum or minimum value of the quadratic function, and graph the function f(x)=-2x^2+2x+9

- algebra -
**Henry**, Monday, July 19, 2010 at 9:30pm
Y = -2X^2 + 2X +9.

Vertex form: a( X - h)^2 + k.

h = Xv = -b/2a = -2/-4 = 1/2

k = Yv = -2(1/2)^2 + 2(1/2) + 9 = 19/2

V(h,k) = (1/2,19/2). a is negative; the

parabola opens downward. Therefore, the

vertex is a max. The line of symmetry is = h = 1/2.

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