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If (f(x)=\sqrt{9-(x-1)^2}), what is the domain?

Answer and explanation

Correct answer: ( [-2,4] )

The direct answer is option A: the domain is [−2,4]. A square root is real only when its radicand is at least zero, so 9−(x−1)²≥0. Rearranging gives (x−1)²≤9, which is equivalent to |x−1|≤3. Therefore −3≤x−1≤3. Adding 1 throughout gives −2≤x≤4, hence the closed interval [−2,4]. The endpoints are included because the radicand becomes zero there, and √0 is defined. Option A is correct. Option B, (−2,4), wrongly removes the endpoints. Option C, [−4,2], shifts the interval incorrectly and does not represent numbers within 3 units of 1. Option D describes values outside the interval, where the radicand is negative and the square root is not real. A helpful picture is a centre 1 and radius 3: all x-values from 1−3 to 1+3 are allowed. Memory cue: for √(9−(x−1)²), stay within 3 units of 1 and include the boundaries.

Related tags

Relations-FunctionsDomain-RangeHardLevel-32

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