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Suppose the graph of y=f(x) includes the points (1,5), (2,3), and (3,1). Based only on this information, there are two points that must be on the graph of y=f(f(x)). If we call those points (a,b) and (c,d), what is ab+cd?

 Nov 13, 2019
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ab + cd = (-11)(7) + (2)(3) = -71.

 Nov 26, 2019

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