Question: For (x) = x 3 , show that the slope of the secant line over [3, x] is x 2 3x + 9, and

For ƒ(x) = x3, show that the slope of the secant line over [−3, x] is x2 − 3x + 9, and use this to estimate the slope of  the tangent line at x = −3.

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