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If f(x)=y for an output y∈B, what can x be called?

Answer and explanation

Correct answer: Preimage of y

In function terminology, if f(x)=y, then x is an input from the domain that maps to the output y. Such an input is called a preimage, or inverse image, of y under f. Therefore option A is correct. The codomain is the whole target set B, not an individual input or output. The range is the set of outputs actually attained by the function, so it is also a set rather than the name for x. An empty set describes the absence of elements and has no role in this statement. A value y may have one preimage, several preimages, or none, depending on the function and the chosen output; when f(x)=y is explicitly given, x is certainly a preimage of y.

Related tags

FunctionsPreimageCodomainRangeFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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