## Precalculus: Mathematics for Calculus, 7th Edition

($\sqrt 11^{}$) / 11
To rationalize this denominator, we will have to get rid of the square root on the bottom, and the only way to do this is to multiply the denominator by $\sqrt 11^{}$. 1. Multiply both numerator and denominator by $\sqrt 11^{}$ 2. This gives you $\sqrt 11^{}$ in the numerator and $\sqrt 121^{}$ in the denominator, which simplifies to 11