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?
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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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