Exercise 47 Page 646

To simplify the given expression, we can first rewrite the radical as a quotient of two radicals. Now, we can rationalize the denominator of the quotient. To do that, we will multiply the numerator and denominator by a factor that will make the denominator a perfect square inside the square root. We will do this using the fact that we can multiply the radicands of radicals if they have the same index.