$${\sqrt{{\frac{{\mathtt{5}}}{\left({\mathtt{9}}{\mathtt{\,\times\,}}{{\mathtt{a}}}^{{\mathtt{2}}}\right)}}}}$$
$${\sqrt{{\frac{{\mathtt{120}}}{{\mathtt{121}}}}}}$$
√[5 /(9a^2)] = √5 / (3a)
√(120 / 121) = √120 / 11 = √(4 * 30) / 11 = (√4 * √30) / 11 = (2/11)√30
