The largest interval on which the function f(x) = x2 + 4x + 2 is increasing is a. [0, ~) b. (-~, 0] c. [-2, ~) d. (-~, -2] e. (-2, ~) The condition that the function is increasing is f '(x) > 0 or f ' (x) 0? Thanks
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if f ' (x) 0, at the x value where f'(x)=0, the function is not increasing, as the slope is 0. Therefore, i think there should not be the equal sign
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