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What is the range of f(x) = x² when the domain is ℝ?

Answer and explanation

Correct answer: [0, ∞)

The governing concept is the range of a real-valued square function. For every real number x, x² is non-negative, so f(x) ≥ 0. The least possible value is 0, and it is actually attained at x = 0 because f(0) = 0. Every positive real number is also attained: if y > 0, choose x = √y or x = −√y, and then x² = y. Thus the function produces 0 and every positive real value, but it can never produce a negative value. The range is therefore [0, ∞). Option B gives non-positive values, which is not the output of squaring; option C incorrectly includes negative numbers, and option D wrongly excludes the attained value 0.

Related tags

RangeSquare FunctionReal DomainReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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