Answer
(a) red curve.
(b) blue curve.
(c) green curve.
(d) See explanations.
Work Step by Step
(a) Graph $y=x^2$ as shown in the figure (red curve).
(b) Graph $y=x^2-2$ as shown in the figure (blue curve).
(c) Graph $y=x^2+2$ as shown in the figure (green curve).
(d) By transformation, (b) can be obtained by shifting (a) 2 units down, (c) can be obtained by shifting (a) 2 units up.
