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What is the range of f(x) = |x + 4| − 5?

Answer and explanation

Correct answer: [−5, ∞)

The key property of an absolute value is |x + 4| ≥ 0 for every real x. Therefore f(x) = |x + 4| − 5 is always at least −5. Equality occurs when x + 4 = 0, or x = −4, so the minimum value −5 is actually attained. As x moves away from −4, |x + 4| can take every nonnegative value, and consequently f(x) can take every value from −5 upward. Thus the range is [−5, ∞), making option A correct. Option B incorrectly ignores the downward shift by 5; option C reverses the direction, and option D includes values less than −5 that the absolute-value expression can never produce.

Related tags

Real-Valued-FunctionsRangeAbsolute-Value-FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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