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What is the range of (f(x)=x^2+9)?

Answer and explanation

Correct answer: ([9,\infty))

The direct answer is B: the range is \([9,\infty)\). The range means all possible output values. For every real x, \(x^2\ge 0\). Adding 9 gives \(x^2+9\ge 9\), so no output can be below 9. The value 9 is actually reached when x=0, because f(0)=0^2+9=9. For any value y≥9, choose x=\(\pm\sqrt{y−9}\); then x^2+9=y. Thus every value from 9 upward occurs, giving \([9,\infty)\). Option A, \([0,\infty)\), is wrong because values such as 1 are impossible. Option B is correct. Option C, \((9,\infty)\), wrongly excludes 9, although x=0 produces it. Option D, all real numbers, is wrong because the output can never be less than 9. Memory cue: a square is at least zero; adding 9 shifts the minimum to 9, and the endpoint is included.

Related tags

RangeQuadratic-FunctionClass11

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