If the function f:B→[−5,∞) defined by f(x)=x2−4x+5 is one-one function, then B is
A
[2,∞)
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B
[0,∞)
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C
[−5,∞)
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D
[−1,∞)
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Solution
The correct option is A[2,∞) f(x)=x2−4x+5 =(x−2)2+1
Clearly, we can conclude from above graph and given options f(x) will be one-one function for x∈[2,∞)