[tex]2 \sqrt{1440} - 4 \sqrt{2} \times ( \sqrt{180} - 3 \sqrt{8} )[/tex]
[tex] = 2 \times 12 \sqrt{10} - 4 \sqrt{2} \times (6 \sqrt{5} - 3 \times 2 \sqrt{2} )[/tex]
[tex] = 24 \sqrt{10} - 4 \sqrt{2} \times (6 \sqrt{5} - 6 \sqrt{2} )[/tex]
[tex] = 24 \sqrt{10} - 24 \sqrt{10} + 24 \sqrt{4} [/tex]
[tex] = 24 \times 2[/tex]
[tex] = 48[/tex]
