Question
Mathematics Question on Functions
Let f : [2, ∞) → R be the function defined by f(x) = x2 - 4x + 5 , then the range of f is
A
(-∞, ∞)
B
[1, ∞)
C
(1, ∞)
D
[5, ∞)
Answer
[1, ∞)
Explanation
Solution
The correct answer is (B) : [1, ∞).
Let f : [2, ∞) → R be the function defined by f(x) = x2 - 4x + 5 , then the range of f is
(-∞, ∞)
[1, ∞)
(1, ∞)
[5, ∞)
[1, ∞)
The correct answer is (B) : [1, ∞).