Rewrite each of the following expressions so that the denominator is rational

MATHEMATICS · Multi-part · GCSE · Mathematics · Algebra · Algebra

Problem

Rewrite each of the following expressions so that the denominator is rational, and simplify the result completely. (a)

\dfrac{7}{2\sqrt{3}}

(b)

\dfrac{5\sqrt{2}}{\sqrt{18}}

(c)

\dfrac{9}{\sqrt{7}}-\dfrac{3}{\sqrt{7}}