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OpenStudy (anonymous):
Graph the function. Identify the vertex and axis of symmetry. f(x) = –2x2 + 4x + 1
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OpenStudy (rulnick):
x at vertex = -4/(2(-2)) = 1 vertex = (1,3) axis of symm is x=1
OpenStudy (anonymous):
OpenStudy (rulnick):
... and DoomDude's wolframalpha plot is good.
OpenStudy (anonymous):
ya
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