### Home > PC > Chapter 11 > Lesson 11.2.1 > Problem 11-74

11-74.

After rationalizing the numerator, did you get:

Is it necessary to rationalize the numerator in this case?

What happens when you just use substitution?

Recall the cubic factoring formula:

11-74.

After rationalizing the numerator, did you get:

Is it necessary to rationalize the numerator in this case?

What happens when you just use substitution?

Recall the cubic factoring formula: