Question

Daca p=$( \sqrt{5} + \sqrt{2} ) ^{2} - \sqrt{2} ( \sqrt{5} + \sqrt{2})- \sqrt{5}( \sqrt{2} - 2\sqrt{5} )$ atunci aratati ca p ∈ N . Help me :o3

Answer 1

p=(5+2+2√10) -√10-2-√10+2.5=7+2√10-2√10+8=15∈N