### Home > CALC > Chapter 5 > Lesson 5.5.1 > Problem 5-158

5-158.

Use the point-slope formula.

Use *f* '(*x*) to find the slope at *x* = 1. You already know the point.

Normal lines are means perpendicular to the tangent line at the point of tangency.

Let *f*(*x*) = the slope in part (b). Solve for *x*. Then find the corresponding *y*-value(s). Write your answer(s) as coordinate point(s).