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What is the range of y = 4 - (x - 1)^2?

Answer and explanation

Correct answer: (-∞, 4]

The governing concept is the range of a quadratic in vertex form. For every real x, (x-1)^2 is non-negative, so -(x-1)^2 is at most 0. Consequently y = 4-(x-1)^2 is always less than or equal to 4. Equality occurs when x-1 = 0, that is, at x = 1; the vertex is therefore (1,4) and gives the maximum value 4. As |x-1| grows, the squared term grows without bound and y decreases without bound. Hence the range is (-∞,4], making option A correct. Option B reverses the inequality, option C uses the wrong vertex value, and option D incorrectly includes values greater than 4.

Related tags

Quadratic-FunctionsRangeVertex-FormGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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