Function f (x) = 1 + X + x ^ 2 / 2 + x ^ 3 / 3?

F '(x) = x ^ 2 + X + 1 = (x + 1 / 2) ^ 2 + 3 / 4 > 0, f (x) increases monotonically
And f (- 3)

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1. The number of intersections between the image and the x-axis of the function f (x) = 13x3-x2-3x-1 is______ One
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