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What is the range of (f(x)=7)?

Answer and explanation

Correct answer: ({7})

The direct answer is B: the range is the singleton set {7}. A range contains the values that the function actually produces. Here f(x)=7 for every allowed input x, so changing x never changes the output. For example, f(0)=7, f(2)=7, and f(−10)=7. Hence the only output is 7, written as {7}. Option A, \(\mathbb R\), is wrong because the function does not produce every real number. Option B is correct because it lists exactly the one attained value. Option C, [7,∞), is wrong because values such as 8 and 20 are not produced. Option D, (−∞,7], is also wrong because values below 7 are not produced. The domain may contain many numbers, but the range can contain only one number for a constant function. Memory cue: constant function means horizontal line and one output, so write the range in braces as {constant}.

Related tags

Real-Valued-FunctionsRangeConstant-Function

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