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If (A={-4,-2,1}), (f:A\to\mathbb{R}), and (f(x)=x^2+2x), what is the range?

Answer and explanation

Correct answer: ({0,3,8})

The direct answer is A, \\({0,3,8}\\). The domain is the finite set \\(A=\\{-4,-2,1\\}\\), so calculate the function for each input. For x=-4, \\(f(-4)=(-4)^2+2(-4)=16-8=8\\). For x=-2, \\(f(-2)=4-4=0\\). For x=1, \\(f(1)=1+2=3\\). The range is the set of distinct outputs, \\({8,0,3}={0,3,8}\\). Option A is correct. Option B merely repeats the domain, not the outputs. Option C has -4, which is an input, not an output; the correct output for -2 is 0, not -4. Option D gives values that do not result from the formula. Memory cue: for a finite domain, substitute every listed input and collect the images.

Related tags

Real-Valued-FunctionsRangeFinite-Domain

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