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If (f:\mathbb{R}\to\mathbb{R}) is given by (f(x)=\sqrt{x^2-10x+29}), what is the range?

Answer and explanation

Correct answer: ([2,\infty))

To find the range, first rewrite the expression under the square root by completing the square: \\(x^2-10x+29=(x-5)^2+4\\). Since a square is always non-negative, the smallest possible value of the expression inside the root is 4, achieved at x=5.

The square root is therefore at least \\(\sqrt4=2\\). As x moves away from 5, \\( (x-5)^2\\) can take every non-negative value and the function increases without bound. Hence every value from 2 onward occurs, so the range is \\([2,\infty)\\). Option A is correct; 0 is not possible because the radicand never falls below 4.

Related tags

Square RootRangeQuadratic

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