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If f(a)=b in f:A→B, what is b called for a?

Answer and explanation

Correct answer: Image

In function notation f:A→B, an input a from the domain A is assigned an output b in the codomain B. The statement f(a)=b specifically says that b is the image of a under f. Thus option A is correct. The input a is called the preimage, or inverse image, of b when discussing this particular correspondence, while b is its image. The domain is the entire set A, not an individual output, so option B is incorrect. A relation is a general set of ordered pairs and is not the name of b itself, so option D is also incorrect. The notation is read as “the image of a under f is b,” which directly establishes the required terminology.

Related tags

Relations And FunctionsImagePreimageFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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