Читать книгу SAT Math For Dummies with Online Practice - Mark Zegarelli - Страница 55

You can multiply any pair of radicals simply by multiplying the values inside the radicals. For example:

Similarly, you can divide one radical by another by dividing their contents:

If x is equivalent to the expression shown here, what is the value of ?

To find the value of x, first simplify . Begin by multiplying the two radicals in the numerator:

Now, divide the numerator by the denominator and simplify:

Thus, , so plug this value into and evaluate:

Therefore, the answer is 11.