### Home > CALC > Chapter 11 > Lesson 11.2.1 > Problem 11-43

11-43.

Let *d* = distance from the origin. Then:

Differentiate:

Evaluate when *x* = –1:

Solve for *d′*.

11-43.

Let *d* = distance from the origin. Then:

Differentiate:

Evaluate when *x* = –1:

Solve for *d′*.