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The function f : [2, ∞) → Y defined by f(x) = x2 – 4x + 5 is both one–one & onto if
  • a)
    Y = R
  • b)
    Y = [1, ∞)
  • c)
    Y = [4, ∞)
  • d)
    Y = [5, ∞)
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The function f : [2, ∞) →Y defined by f(x) = x2–4x + ...
Since the function f is defined only on the interval [2, 6], any value of x outside this interval is not in the domain of f. Therefore, the domain of f is:

Domain of f = [2, 6]
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The function f : [2, ∞) →Y defined by f(x) = x2–4x + 5 is both one–one & onto ifa)Y = Rb)Y = [1, ∞)c)Y = [4, ∞)d)Y = [5, ∞)Correct answer is option 'B'. Can you explain this answer?
Question Description
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