The function f is one-to-one. Find its inverse.f(x) = x2 + 2, x ? 0
A. f-1(x) = 
, x ? -2
B. f-1(x) = 
- 2, x ? 0
C. f-1(x) = 
, x ? 2
D. f-1(x) = 
- 2, x < 0
Answer: C
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