1. Let f(x) = x3 – 3a² – 9x + 10 for 1< æ < 9. (a) Use f'(x) to determine where f is increasing and where f is de- creasing on the interval (1, 9). (b) Find the upper and lower sums for f(x) on the interval (1,9] with n = 4 subdivisions.

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