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how do i solve this? how can i simplify it?

$(\sqrt{7x} - \sqrt{2y})^2$

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    @Arturo Obviously the OP seeks to solve the problem of simplifying the expression. As a native (US) English speaker, I see no problem using the word solve in such a context.2011-04-19

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In general, $(a - b)^2 = a^2 + b^2 - 2ab$. So here, we get that $(\sqrt{7x} - \sqrt{2y})^2 = 7x + 2y -2 \sqrt{14xy}$. Unfortunately, there is nothing to 'solve' since that would require there to be some constraint, e.g. $(\sqrt{7x} - \sqrt{2y})^2 = 0$. But this is a simpler form.

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    I $d$o not understand the notation in your last co$m$$m$ent...2011-04-19