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If f(x)=x−4 and the domain of the function is A={4,5,9}, what is the value of f(A)?

Answer and explanation

Correct answer: {0,1,5}

The set f(A) contains the function values corresponding to every element of A. Thus, f(4)=4−4=0, f(5)=5−4=1, and f(9)=9−4=5. Therefore, f(A)={0,1,5}. Option B is the original domain A, not its image under f. Exam tip: To find an image set, substitute each element of the domain into the function one by one.

Related tags

FunctionsImage-SetDomain-RangeFunction-EvaluationReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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