1. Rationalizing Denominators With Two Terms In a previous modules we rationalized a single term denominator. We now turn our attention to rationalizing two term denominators. Example 1 Rationalize the denominator:

2. What should be multiplied times the denominator to eliminate the radical? The is still a radical in the result!

3. Try something a little different.

4. The radical has been eliminated!

5. The pattern we used was the original denominator … times the same two term expression, except for the opposite sign. These two expressions are called conjugates.

6. To rationalize a two term denominator multiply both numerator and denominator by the conjugate of the denominator. Back to our original problem - rationalize the denominator

7. Multiply both numerator and denominator by the conjugate of the denominator. Based on earlier work, we get … or

8. Example 2 Rationalize the denominator:

9. Numerators:

10. Denominators:

11. Putting it back together …