Aici folosim formula de calcul prescurtat
[tex](x + y)^{2} = {x}^{2} + 2 \times x \times y + {y}^{2} [/tex]
[tex] {(3 \sqrt{2} })^{2} + 2 \times 3 \sqrt{2} \times 2 + {2}^{2} [/tex]
[tex] \sqrt{ {x}^{2} } = x[/tex]
[tex]9 \times 2 + 12 \sqrt{2} + 4 \\ 18 + 12 \sqrt{2} + 4 \\ 22 + 12 \sqrt{2} = 2(11 + 6 \sqrt{2} )[/tex]
