Question

Aratati ca a=2(8+√18)-3•(4+√8)apartine Z

Answer 1

$a = 2(8 + \sqrt{18} ) - 3(4 + \sqrt{8} )$

$a = 2( 8 + 3 \sqrt{2} ) - 3(4 + 2 \sqrt{2} )$

$a = 16 + 6 \sqrt{2} - 12 - 6 \sqrt{2}$

$a = 4 \: \epsilon \: Z$