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f(b)-f(a)/b-a = f'(c) MVT to find f(b) and f(a), just plug endpoints into original function f(b) = f(4) = (2/3) f(a) = f(1) = (1/3) (2/3)-(1/3) ----------- = f'(c) 4 - 1 (1/9) = f'(c) next, find derivative of f(x) f'(c) = f'(x) product rule (1/9) =