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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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