[tex]a = 1 + \sqrt{2} - \sqrt{3} = 0.6821627548[/tex]
[tex]b = \sqrt{4} + \sqrt{8 } - \sqrt{12} \\ = 2 + \sqrt{8} - \sqrt{12} \\ = 2 + 2 \sqrt{2} - 2 \sqrt{3} = 1.36432551[/tex]
[tex]2 \times a - b = 2a - b = 2 \times 0.6821627548 - 1.36432551 = 1.364325508 - 1.36432551 = −0.000000002[/tex]
