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OpenStudy (anonymous):
If x^2 + 2xy + y^2 = 81, x + y= (a) 7 (b) 8 (c) 9 (d) 10 (e) 11
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OpenStudy (alexwee123):
x^2 + 2xy + y^2 = (x+y)^2 so... (x+y)^2=81 x+y=9
OpenStudy (alexwee123):
so C would be your answer ^.^
OpenStudy (anonymous):
\[(x+y)^2 = x^2 + y^2 + 2xy \implies (x+y)^2 = 81 \implies x+y = 9\]
OpenStudy (anonymous):
thank you guys
OpenStudy (alexwee123):
any time ^.^
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OpenStudy (anonymous):
Welcome..
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