In the xy-plane shown, the shaded region consists of all points that lie above the graph of y = x^{2} - 4x and below the x- axis. Does the point (a,b) (not show ) lie in the shaded region if b < 0?
(1) 0 < a < 4
(2) a^{2} - 4a < b
应版权方要求，不支持在线看题功能，感谢您的理解。
In the xy-plane shown, the shaded region consists of all points that lie above the graph of y = x^{2} - 4x and below the x- axis. Does the point (a,b) (not show ) lie in the shaded region if b < 0?
(1) 0 < a < 4
(2) a^{2} - 4a < b
正确答案: B