Let f(x) = 24 /x - 4x. a. Find all points on the graph off at which the tangent line is horizontal. 5 b. Find all points on the graph of f at which the tangent line has slope -5.

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A: Here, an=4n2+3n-2n, n≥1     =4n2+3n-2n4n2+3n+2n4n2+3n+2n     =4n2+3n-4n24n2+3n+2n     =3n4n2+3n+2n

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