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What is the domain of the function \(f(x)=\sqrt{3x+12}\)?

Answer and explanation

Correct answer: \([-4,\infty)\)

A real square root is defined only when its radicand is non-negative. Thus, \(3x+12\ge 0\), which gives \(x\ge -4\). Therefore, the domain is \([-4,\infty)\). Option B uses the wrong direction of the inequality, and \(-4\) must be included because the square root is zero there. Exam tip: For a square-root function, set the expression under the root greater than or equal to zero.

Related tags

DomainSquare-Root-FunctionsReal-Valued-FunctionsLinear-InequalityInterval-NotationReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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