x=7-2y
x^2+y^2=13
צריך למצוא את X ו Y
תודה
x=7-2yx^2 + y^2 = 13 (7-2y)^2 + y^2 = 1349 - 28y + 4y^2 + y^2 = 135y^2-28y + 36 = 0 y1,2 = 28+- sqrt (784 - 4*5*36 ) / 2*5 y1,2 = 28+-8 / 10y1 = 36 / 10 = 3.6y2 = 20 / 10 = 2x1 = 7-2*3.6 = -0.2 x2 = 7-2*2 = 3
(7-2y)^2 + y^2 = 13
49 - 28y + 4y^2 + y^2 = 135y^2-28y + 36 = 0
y1,2 = 28+- sqrt (784 - 4*5*36 ) / 2*5
y1,2 = 28+-8 / 10y1 = 36 / 10 = 3.6y2 = 20 / 10 = 2
x1 = 7-2*3.6 = -0.2 x2 = 7-2*2 = 3