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OpenStudy (anonymous):
What is the axis of symmetry of the function f(x) =-(x+9)(x-21)
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OpenStudy (anonymous):
@Michele_Laino @Nnesha @wio @iambatman
OpenStudy (anonymous):
You need to complete the square to find the vertex.
OpenStudy (anonymous):
The \(y\) coordinate of the vertex is the axis of symmetry.
OpenStudy (anonymous):
whoops, I mean the \(x\) coordinate is the axis of symmetry.
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