Question

Решите систему уравнений {x^2+y^2=10; x^2-y^2=8

Answer 1

Х^2 + y^2 = 10
X^2 - y^2 = 8
X^2 + x^2 + y^2 - y^2 = 10 + 8
2x^2 = 18
X^2 = 9
X1 = 3 ; X2 = - 3
9 + y^2 = 10
y^2 = 1
y1 = 1 ; y2 = - 1
Ответ ( 3 ; 1 ) ; ( - 3 ; - 1 )