Question 46

Let f : R −   → R be defined by f (x) = 5 x − 3 . Then 5  –1

• (A)f (x) = f (x)
• (B)f –1 (x) = – f (x)
• (C)(fof)x=–x
• (D)f –1 (x) = f (x)  x ,if x is rational