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If f(a)=b, what is a called for b?

Answer and explanation

Correct answer: Preimage

In the notation f(a)=b, the function takes the input a and produces the output b. The input a is therefore called a preimage, or inverse image, of b under f. The output b is called the image of a. This distinction is based on the direction of the mapping: a→b. Hence option A is correct. Image and preimage are not interchangeable terms. The range is the set of all actual outputs produced by the function from its domain, so it is a set rather than the particular input a. The codomain is the declared target set in which outputs are required to lie; it may contain elements that are not actually attained. Thus neither range nor codomain names a in the equation f(a)=b.

Related tags

Relations FunctionsPreimageImageDomainFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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