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OpenStudy (anonymous):
plzz.. help im lost! = Which is the vertex form of the expression y = -1/2x2 + 4x - 9
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OpenStudy (anonymous):
Apply complete square!
OpenStudy (anonymous):
don't know how?? confused help what would it be?
OpenStudy (anonymous):
= -1/2 ( x -4)² -1
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