Find the slope of the tangent to the curve:
at x= -2
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The slope of the tangent line of `f(x)` at `a` is `f'(a)`
That is, you find the derivaive of `f` and then plug in `a`
`f'(-2) = 3(-2)^2-2(-2)-1=15`
So the slope of the tangent line of f at -2 is 15.
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