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What is the range of (f(x)=\sqrt{x^2-1})?

Answer and explanation

Correct answer: ( [0,\infty) )

The direct answer is A: [0,∞). A square root can never be negative. First require x²−1≥0, so x≤−1 or x≥1; this is the domain. At x=1 or x=−1, f(x)=√0=0, so 0 is included. For any y≥0, choose x=√(y²+1), which belongs to the domain; then √(x²−1)=√y²=y. Therefore every non-negative real number occurs, and no negative number can occur. Option A is correct. Option B [1,∞) wrongly excludes the value 0 and all values between 0 and 1. Option C includes negative outputs, impossible for a square root. Option D contains only non-positive values and misses all positive outputs. Memory cue: √ means the principal, non-negative root; check both domain and range.

Related tags

Relations-FunctionsRangeRadicalInequality

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