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Take the derivative for the derivative function.
`f'(x)= 21/5 x^2`
Substitute the point where x=0 to find the slope at that point.
`f'(x)= 21/5 (0)^2= 0`
The slope at that point is zero.
Graph the original function.
Graph the derivative function.
We can then see that we have a horizontal slope at x=0.
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