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The relation (R={(x,y):y^2=2x,\ x\in{2,8,18},\ y\in{-6,-4,-2,2,4,6}}) is considered from the given domain to the codomain. What is the correct conclusion?

Answer and explanation

Correct answer: It is not a function because (2) has two images

The direct answer is B. For a function, every element of the domain must have exactly one image. Use y²=2x. For x=2, y²=4, so y=2 or y=-2; thus 2 has two images. For x=8, y²=16, so y=4 or y=-4. For x=18, y²=36, so y=6 or y=-6. All these y-values are listed in the codomain, but the two outputs for each input mean the relation is not a function. Option B is correct because x=2 alone already proves failure. Option A is wrong because the relation does not satisfy uniqueness. Option C is wrong because 8 does have images, 4 and -4. Option D is wrong for the same reason as A, and its proposed range {2,4,6} also ignores the negative outputs; in any case, the relation is not a function. The exam cue is: solve for y and check whether one x gives two signs.

Related tags

RelationFunction TestSquare Relation

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