4. i) Determine the values of a and b for fx) - -2x³ + ax + bx + 6 so that f'(-2) - 0 and f'(7) - 0. ii). For what values of x is f(x) increasing? O a=10 b-74 and f is increasing on the interval (-2,7) a-10 b-74 and f is increasing on the interval (2,7) a-15 b-84 and fis increasing on the interval (-2,7) None of the above

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