Chapter 10 - Exponents and Radicals - 10.5 Expressions Containing Several Radical Terms - 10.5 Exercise Set - Page 661: 55

$2t+2\sqrt{10t}+5$

Using $(a+b)^2=a^2+2ab+b^2$, or the square of a binomial, and the properties of radicals, the given expression, $ (\sqrt{2t}+\sqrt{5})^2 ,$ is equivalent to \begin{array}{l}\require{cancel} (\sqrt{2t})^2+2(\sqrt{2t})(\sqrt{5})+(\sqrt{5})^2 \\\\= 2t+2\sqrt{10t}+5 .\end{array}