Odpowiedź:
a)
[tex] (\sqrt{2 } + \sqrt{8} ) {}^{2} = ( \sqrt{2} + \sqrt{8} )( \sqrt{2} + \sqrt{8} ) = \sqrt{4} + \sqrt{16} = 2 + 4 = 6[/tex]
b)
[tex] ( \sqrt{3} + 2 \sqrt{6} ) {}^{2} = ( \sqrt{3} + 2 \ \sqrt{ 6} )( \sqrt{3} + 2 \sqrt{6} ) = \sqrt{9} + 4 \sqrt{36 } = 3 + 4 \times 6 = 3 + 24 = 27[/tex]
c)
[tex]( \sqrt{10} - \sqrt{3} )( \sqrt{10} + \sqrt{3) } = \sqrt{100} - \sqrt{9} = 10 - 3 = 7[/tex]
