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What is the domain of the function (f(x)=\sqrt{5-2x})?

Answer and explanation

Correct answer: (x\le \frac{5}{2})

For a square-root function to have a real value, the expression inside the square root must be non-negative. In this function the radicand is 5−2x, so the required condition is \\(5-2x\\ge0\\). Solving it gives \\(-2x\\ge-5\\). When we divide by the negative number −2, the inequality sign reverses, giving \\(x\\le5/2\\).

The endpoint x=5/2 is included because the radicand then equals zero, and \\(\\sqrt{0}\\) is defined. Values smaller than 5/2 make the radicand positive, while values larger make it negative and produce no real function value. Therefore the domain is all real x satisfying \\(x\\le5/2\\), so option A is correct. The strict inequality in option C wrongly excludes the valid endpoint.

Related tags

DomainRadicalInequality

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