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      Question

      Which of the following is an identity

      function?
      A f (x) = 1 Correct Answer Incorrect Answer
      B f (x) = Ixl Correct Answer Incorrect Answer
      C f (x) = 0 Correct Answer Incorrect Answer
      D f (x) = x Correct Answer Incorrect Answer

      Solution

      An identity function is a function where the output equals the input, i.e., f(x) = x for all values of x. Other options do not satisfy this condition:  f(x) = 1 and f(x) = 0 are constant functions. f(x) = |x| is an absolute value function.

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