### Home > CALC > Chapter 7 > Lesson 7.3.3 > Problem 7-134

7-134.

Find the equation of a line tangent to the graph of at

Use the tangent line to find an approximate value of

.Because

is hard to evaluate, the tangent line atwill give a decent approximation of.Is your approximation an over or under estimate? Use the second derivative to justify your answer.

That will indicate if the tangent line is above or below the graph.