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Which statement about x² + 4 ≥ 4 is correct?

Answer and explanation

Correct answer: It is true for all x ∈ ℝ

The governing fact is that the square of every real number is non-negative: x² ≥ 0. Adding 4 to this inequality gives x² + 4 ≥ 4, so the statement holds for every real value of x. Equality occurs when x = 0, since 0² + 4 = 4; for every nonzero real x, x² is positive and the left side is greater than 4. Thus the result is universal, not restricted to positive or negative numbers. Option B excludes x = 0 and all negative values, while option C excludes zero and all positive values. Option D contradicts the basic non-negativity property of a square. Therefore option A is the only valid answer.

Related tags

Linear-InequalitiesNonnegative-SquareUniversal-StatementReal-NumbersIntroduction To InequalitiesLinear InequalitiesMathematicsClass 11 Mcq

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