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What is the range of f(x)=√(9-(x+1)^2)?

Answer and explanation

Correct answer: [0,3]

The governing concept is the range of a square-root function. A square root is always non-negative, so f(x) cannot be less than 0. For the expression to be defined, 9-(x+1)^2 must lie between 0 and 9. Its maximum value is 9, attained when x=-1, giving f(-1)=√9=3. Its minimum allowed value is 0, attained when x=-4 or x=2, giving f(x)=0. Every intermediate value from 0 through 3 occurs, so the range is [0,3]. Thus option A is correct. Option B incorrectly permits negative outputs, option C confuses the radicand with its square root, and option D ignores the real-domain restriction.

Related tags

Real-Valued-FunctionsRangeSquare-Root-FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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