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If (f:\mathbb{R}\to\mathbb{R}) is given by (f(x)=\sqrt{x^2-6x+10}), what is the range?

Answer and explanation

Correct answer: ([1,\infty))

The expression under the square root can be rewritten by completing the square: \\(x^2-6x+10=(x-3)^2+1\\). Since a square is always non-negative, \\((x-3)^2\\ge0\\), so the quantity inside the root is always at least 1. It reaches 1 when \\(x=3\\). Therefore, the smallest value of the function is \\(\\sqrt1=1\\).

As x moves away from 3 in either direction, \\((x-3)^2\\) increases, so the square-root value can become arbitrarily large. Every value from 1 onward is obtained, because for any \\(y\\ge1\\), the equation \\(y=\\sqrt{(x-3)^2+1}\\) can be satisfied by a suitable real x. Hence the range is \\([1,\\infty)\\), so option A is correct. The range is not \\([0,\\infty)\\), because values below 1 cannot occur.

Related tags

Square RootRangeQuadratic

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