Question

Решите систему уравнений: x^2+y^2=29
                                                 x^2-y^2=21

Answer 1

$left { {{x^2+y^2=29} atop {x^2-y^2=21}} right. |+\\2x^2=50\x^2=25\x_{1,2}=б5\\(б5)^2-y^2=21\25-y^2=21\y^2=4\y_{1,2}=б2$

Ответ: (5;2), (-5;2), (5;-2), (-5; -2)