How does (40/square root 2) becomes 8*square root 2?

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How does (40/square root 2) becomes 8*square root 2?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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\[20\sqrt{2}\]
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\[(40/\sqrt{2}) *(\sqrt{2}/\sqrt{2})\] Simply by multiplying by a number over itself is a clever way of changing a number into a slightly different form. You can do this because any number divided by itself equals 1, just like 5*1=5.

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...so the answer is that 40/sqrt2 becomes 8sqrt2 by multiplying by 2/5 :P

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