Let f(x)=x²-5x - 36. (a) Find the interval(s) where f(x) is increasing. (Enter your answer using interval notation.) (b) Find the interval(s) where f(x) is decreasing. (Enter your answer using interval notation.) (c) Find the x-value(s) of all local maxima of f(x). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) X = (d) Find the x-value(s) of all local minima of f(x). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) X =

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