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5-155.

Let . Homework Help ✎

  1. ​Write the equation of the line tangent to .

    Use the slope, which is , and the point to write the equation.

  2. Use your tangent line to approximate .

  3. Is the approximation an overestimate or an underestimate of the actual value?

    If is concave up at , then the approximation is an underestimate.