Question

como eu vou desenvolver ( √5+√2)²

Answer 1

$\ \ \ \ ( \sqrt{5}+\sqrt{2} )^2 \\=( \sqrt{5}+\sqrt{2} )\cdot( \sqrt{5}+\sqrt{2} ) \\=(\sqrt{5})^2+\sqrt{5}\cdot\sqrt{2} +\sqrt{5}\cdot\sqrt{2} + (\sqrt{2})^2 \\=5+\sqrt{10}+\sqrt{10} + 2 \\=2\sqrt{10}+\sqrt{10} +5+ 2 \\=2\sqrt{10} +7$