Question

$( sqrt{13} + sqrt{2} ) {}^{2}$

Answer 1

$( sqrt{13} + sqrt{2}) ^2 = sqrt{13}^2 + 2 cdot sqrt{13} cdot sqrt{2} + sqrt{2}^2 = \ = 13 + 2 sqrt{13 cdot 2} + 2 = 15 + 2 sqrt{26}$