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(x + y)2 = 64 et x y = 15, alors x2 + y2​
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(x + y)2 = 64 et x y = 15, alors x2 + y2​

User Guckmalmensch
by
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1 Answer

12 votes

Answer:


x^2+y^2=34

Explanation:

Expand
(x+y)^2.


(x+y)^2=x^2+2xy+y^2


x^2+2xy+y^2=64

Substitute 15 for xy.


x^2+2(15)+y^2=64\\\\x^2+30+y^2=64\\\\x^2+y^2=34

User Gazmend
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