Question 1064333
f''(x) not = 0, tells us that f'(x) is increasing or decreasing
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1) f''(x) < 0, we know the slope of the tangent line (f'(x)) to f(x) is decreasing as x increases and we say that f(x) is concave down(graphically a parabola that curves downward)
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2) f''(x) > 0, we know the slope of the tangent line (f'(x)) to f(x) is increasing as x increases and we say that f(x) is concave upward(graphically a parabola that curves upward)
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