The two expressions comprise the sum and the difference of the same two expressions, and can be multiplied using the difference of squares formula:

The square of the square root of an expression is the expression itself, so:

An expression with a radical expression in the denominator is not simplified, so to simplify, it is necessary to rationalize the denominator. This is accomplished by multiplying both numerator and denominator by the given square root, , as follows:

The expression can be simplified further by dividing the numbers outside the radical by greatest common factor 5:

This is the correct response.

To simplify a radical expression, first find the prime factorization of the radicand, which is 66 here.

There are no repeated prime factors, so the expression is already in simplified form. 

To simplify a radical expression, first find the prime factorization of the radicand. First, we will simplify  as follows:

Pair up like factors, then apply the Product of Radicals Property.

By similar reasoning,

11 is a prime number, so  cannot be simplified. We can replace it with .

Through substitution, and the distribution property:

To simplify a radical expression, first find the prime factorization of the radicand, which is 32 here.

Pair up like factors, then apply the Product of Radicals Property:

,

the simplest form of the radical.

To simplify a radical expression, first find the prime factorization of the radicand. First, we will simplify  as follows:

By the Product of Radicals Property,

11 is a prime number, so  cannot be simplified. We can replace it with .

Through substitution, and the distribution property:

To simplify a radical expression, first find the prime factorization of the radicand, which is 40 here.

Pair up like factors, then apply the Product of Radicals Property:

,

the simplest form of the radical.

To simplify a radical expression, first find the prime factorization of the radicand. First, we will attempt simplify  as follows:

Since no prime factor appears twice, the expression cannot be simplified further. The same holds for , since ; the same also holds for , since 11 is prime. 

It follows that the expression  is already in simplest form.

When simplifying a fraction with a denominator which is the sum or difference of an integer and a square root, it is necessary to first rationalize the denominator. This is accomplished by multiplying both halves of the fraction by the conjugate of the denominator—the result of changing the plus symbol to a minus symbol (or vice versa); therefore, both halves of the given expression must be multiplied by the conjugate of , which is .

 is therefore the correct choice.

The two expressions comprise the sum and the difference of the same two expressions, and can be multiplied using the difference of squares formula:

The square of the square root of an expression is the expression itself, so: