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algebra

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49
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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

#1
+112570
+1

$$x^2+y^2+2xy=30+2xy\\ (x+y)^2=30+2xy\\$$

You can finish it.

Jan 31, 2021