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What is the range of the function \(f(x)=\log_{2}(x^2+2x+2)\)?

Answer and explanation

Correct answer: \([0,\infty)\)

Complete the square: \(x^2+2x+2=(x+1)^2+1\), so the logarithm's argument has minimum value \(1\), attained at \(x=-1\), and is unbounded above. Since \(\log_2\) is increasing, the function has minimum value \(\log_2 1=0\) and grows without bound. Its range is \([0,\infty)\).

Related tags

RangeLogarithmsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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