Răspuns:
[tex]( \sqrt{3} + \sqrt{7} )( \sqrt{3} + \sqrt{7} ) \\ = \sqrt{3} \times \sqrt{3} + \sqrt{3} \times \sqrt{7} + \sqrt{7} \times \sqrt{3} + \sqrt{7} \times \sqrt{7} \\ = 3 + \sqrt{3} \times \sqrt{7} + \sqrt{7} \times \sqrt{3} + 7 \\ = 10 + 2( \sqrt{3 } + \sqrt{7)} [/tex]
