Exercise 1

For the function,

(a) Find the tangent line to the function at the specified value of *x*.

(b) Use the tangent line from (*a*) to estimate the value of the function at (*x* + Δ *x*).

*f* (*x*) = *x*^{3} + 2*x* + 1, *x* = 1, Δ *x* = .2

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