<PRE><B>Question 613084</B>
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*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sqrt{2}\,\cdot\,\sqrt{10}]


Use


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sqrt{a}\,\cdot\,\sqrt{b}\ =\ \sqrt{ab}]


Note that


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 20\ =\ 4\ \times\ 5] and *[tex \LARGE 4] is a perfect square.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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