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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