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

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

User Dreza
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1 Answer

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(x+y)^2=x^2+y^2+2xy=73+2*24=73+48=121

⇒ (x+y)^2=121
User Bruno Mazzardo
by
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