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3 December, 19:42

If x^2+y^2=73 and xy=24, what is the value of (x+y) ^2? And Why?

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  1. 3 December, 21:43
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    (x+y) ^2=x^2+y^2+2xy=73+2*24=73+48=121

    ⇒ (x+y) ^2=121
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