[tex]a = \sqrt{216} - \sqrt{96} + \sqrt{54} - \sqrt{150} + \sqrt{600} \\ a = 6 \sqrt{6} - 4 \sqrt{6} + 3 \sqrt{6} - 5 \sqrt{6} + 10 \sqrt{6} \\ a = 10 \sqrt{6} [/tex]
[tex]b = \sqrt{128} - \sqrt{50} + \sqrt{32} - \sqrt{162} + \sqrt{98} \\ b = 8 \sqrt{2} - 5 \sqrt{2} + 4 \sqrt{2} - 9 \sqrt{2} + 7 \sqrt{2} \\ b = 5 \sqrt{2} [/tex]
[tex]a \times b = 10 \sqrt{6} \times 5 \sqrt{2} = 50 \sqrt{12} = 50 \times 2 \sqrt{3} = 100 \sqrt{3} [/tex]
