3．（a）On separate diagrams sketch the curves with the following equations．On each sketch you should mark the coordinates of the points where the curve crosses the coordinate axes．
（i）\(y = x ^ { 2 } - 2 x - 3\)
（ii）\(y = x ^ { 2 } - 2 | x | - 3\)
（iii）\(y = x ^ { 2 } - x - | x | - 3\)
（b）Solve the equation $$x ^ { 2 } - x - | x | - 3 = x + | x |$$