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If f={(1,2),(2,4),(3,6),(4,8)}, what is f(4)?

Answer and explanation

Correct answer: 8

The governing concept is evaluation from an ordered-pair representation. In a pair (input, output), the first component identifies the input and the second component gives its function value. To find f(4), locate the pair whose first component is 4. The given function contains (4,8), so f(4)=8. Therefore option A is correct. The other values correspond to different roles or inputs: 4 in option B is the argument itself, 6 is the image of 3 because (3,6) is present, and 2 is the image of 1. A common error is to select the first component instead of the second or to read a neighboring pair. Since every listed input has exactly one image, the value is direct and unambiguous.

Related tags

FunctionsFunction-ValueOrdered-PairsMathematicsClass 11Functions As A Special Kind Of RelationRelations And FunctionsClass 11 Mcq

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