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Algebra 20 Online
OpenStudy (charlie):

I'm having a bad time trying to find the vertex of this function f(x)=-2x^3+8x. believe me that is the function, I already find the zeros (x=0)(x-2)(x=2) but after that i don't know what to do

OpenStudy (welshfella):

the graph of this function will have 2 turning points which yo can find by drawing the graph or using calculus

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