[tex] \sqrt{2} \times \sqrt{6} = \sqrt{2 \times 6} = 2 \sqrt{3} [/tex]
[tex] \sqrt{3} \times \sqrt{6} = \sqrt{3 \times 6} = 3 \sqrt{2} [/tex]
[tex] \sqrt{7} \times 3 \sqrt{14} = 21 \sqrt{2} [/tex]
[tex]7 \sqrt{2} \times 5 \sqrt{70} = 70 \sqrt{35} [/tex]
