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Rationalization of the denominator in the radicand

There will be two different cases:

Simple rationalization. Multiply the numerator and denominator of the radicand by such a number as will make the denominator a perfect nth power (here n = 3) and then remove the denominator from under the radical sign.
Rationalizing binomial denominators. To rationalize a fraction whose denominator is a binomial with radicals of index 2, multiply numerator and denominator by the conjugate.

$\frac{7}{\sqrt{3}-\sqrt{10}}=$

Note: Don't forget using the sign "+" or "-" between the radicals