Let *f*(*x*) = *x*^{3} - 4*x* + 5. Then

*f*'([text]) = [text].

Below is the plot of *f*, its derivative *f* '(*x*) = 3*x*^{2} - 4, and the tangent line at *x* = [number]. **Drag the point** on the graph of *f* to move the tangent line.

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