ANSWER
[tex]12 \sqrt{5} [/tex]
EXPLANATION
The given expression is
[tex] \sqrt{2} \times \sqrt{72} \times \sqrt{5} [/tex]
The middle radical contains a perfect square.
[tex]\sqrt{2} \times \sqrt{36 \times 2} \times \sqrt{5} [/tex]
[tex]\sqrt{2} \times \sqrt{36} \times \sqrt{2} \times \sqrt{5} [/tex]
[tex]6\sqrt{2} \times \sqrt{2} \times \sqrt{5} [/tex]
Note that:
[tex] \sqrt{a} \times \sqrt{a} = a[/tex]
[tex]6\times 2 \sqrt{5} = 12 \sqrt{5} [/tex]
