If and , then what is ?

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Guest Jan 31, 2015

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x + y =2 and , then what is ?

$\\(x+y)^2=x^2+y^2+2xy\\ so\\ x^2+y^2=(x+y)^2-2xy\\ x^2+y^2=2^2-2*23\\ x^2+y^2=4-46\\ x^2+y^2=-42\\$

Melody Jan 31, 2015

Melody · Answer 1 · 2015-01-31T02:07:00

x + y =2 and , then what is ?

$\\(x+y)^2=x^2+y^2+2xy\\ so\\ x^2+y^2=(x+y)^2-2xy\\ x^2+y^2=2^2-2*23\\ x^2+y^2=4-46\\ x^2+y^2=-42\\$