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If \(f(x)=x^2+4x+7\), where \(x\in\mathbb{R}\), what is the minimum value of the function?

Answer and explanation

Correct answer: 3

Completing the square gives \(f(x)=x^2+4x+7=(x+2)^2+3\). Since \((x+2)^2\geq 0\), its least value is 0, attained at \(x=-2\). Therefore, the minimum value of the function is \(3\). Option 7 is merely the value at \(x=0\), not the minimum. Exam tip: For a quadratic function, complete the square or use its vertex to find the minimum or maximum value.

Related tags

Standard-FunctionsQuadratic-FunctionsCompleting-The-SquareVertex-FormMinimum-ValueReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And Functions

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