Find the critical numbers, intervals of inc/dec, relative extrema (part 1)

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(Calculus 1) Consider the following function. Use a graphing utility (Desmos) to confirm your answers. f(x)=x^2/(x^2-49)
a) Find the critical numbers of f.
b) Find the open intervals on which the function is increasing or decreasing.
c) Apply the First Derivative Test to identify all relative extrema.

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