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\[\begin{cases} { x }^{ 2 }+{ y }^{ 2 }=30 \\ x+y=10 \end{cases}\]

If the above equations are true simultaneously, then find the value of $xy$.

 Jan 30, 2021
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\(x^2+y^2+2xy=30+2xy\\ (x+y)^2=30+2xy\\ \)

 

You can finish it.

 Jan 31, 2021

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