Posted by Bill on Tuesday, November 8, 2011 at 8:23pm.
consider
y = (x+17)(x-6)(x+14)
this cubic would have x-intercepts at
x = -17, -14, and 6
its first term is x^3, so it would rise in the 1st quadrant.
So the curve is above the x-axis, or positive for
-17 < x < -14 or x > 6
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