Let ƒ : R → R, x ↔ x² − 4x + 7. (a) Is f injective? If not, find the largest possible set DCR such that ƒ : D → R is injective. (b) Is f surjective? If not, find the largest possible set CCR such that ƒ : R → C is surjective. (c) Is f bijective? If not, find D, C C R such that ƒ : D → C is bijective. Find the inverse function f-¹: C → D. (d) Draw the graph of both functions, f: D→ C and f-¹: C → D.

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