### Home > APCALC > Chapter 7 > Lesson 7.3.4 > Problem 7-145

7-145.

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

Use the tangent line to approximate the value of

.Because

is hard to evaluate, the tangent line atwill give a decent approximation of .Is your approximation an overestimate or an underestimate? Use the second derivative to justify your answer. Homework Help ✎

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