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Kjcampbell2
12.01.2020 •
Mathematics
If $x$ and $y$ are positive real numbers for which $(x + y)^2 + (x - y)^2 = 10$ and $(x + y)^4 + (x - y)^4 = 98$, what is the value of $xy$? express your answer in simplest radical form.
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Ответ:
Ответ:
4
Step-by-step explanation:
add the area