X = 1 - Y (1-Y)^2 + Y^2 = 25 1 - 2Y + Y^2 + Y^2 = 25 2Y^2 - 2Y - 24 = 0 2*(Y^2 - Y - 12) = 0 D = 1 -4*1*(-12) = 1 + 48 = 49 ( V D = 7) Y1 = ( 1 + 7) \ 2 = 4 Y2 = (-6) \ 2 = ( -3) X = 1 - Y X1 = 1 - 4 = ( - 3) X2 = 1 -(-3) = 1 + 3 = 4