If the monotone increasing interval of function f (x) = 1 / 3x ^ 3 + BX ^ 2 + 5x is (1,5), then the real number B is Can we get the value of B? Shouldn't we get the range?

Look at the question, the result is interval! But I think the question you gave should have a little problem. That is, the coefficient of the cubic term should be negative, so B of this question should be a value. Are you looking at it? Yes, B = - 3

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