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For real x, what is the minimum value of the function \(f(x)=x^2+2x+5\)?

Answer and explanation

Correct answer: 4

Completing the square gives \(f(x)=x^2+2x+5=(x+1)^2+4\). Since \((x+1)^2\geq 0\), its least value is 0, attained at \(x=-1\). Therefore, the minimum value of the function is 4. Exam tip: For a quadratic written as \((x-h)^2+k\), the minimum value is directly k.

Related tags

Standard-FunctionsQuadratic-FunctionsCompleting-The-SquareMinimum-ValueGraph-Of-QuadraticGraphs Of Standard FunctionsRelations And FunctionsMathematics

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