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Let A={0,1,2,3} and f(x)=x²−3x+2. Which ordered pair will not be in the graph of f?

Answer and explanation

Correct answer: (3,1)

Answer: option D, (3,1). A graph of f with domain A contains an ordered pair (x,f(x)) for each x in A. We test the first coordinate of every option. For x=0, f(0)=0²−3(0)+2=2, so (0,2) is present. For x=1, f(1)=1−3+2=0, so (1,0) is present. For x=2, f(2)=4−6+2=0, so (2,0) is present. For x=3, f(3)=9−9+2=2, so the graph contains (3,2), not (3,1). Hence D is the only pair that does not belong. The domain tells us which x-values may be used; the output must still equal the stated formula. A common error is checking only whether x belongs to A and forgetting to calculate y=f(x).

Related tags

Relations-FunctionsFunction-GraphOrdered-PairsEvaluationFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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