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For the function \(f(x)=\lfloor 3x\rfloor\), what is the value of \(f(x)\) at \(x=-0.4\)?

Answer and explanation

Correct answer: -2

Substituting \(x=-0.4\) gives \(3x=3(-0.4)=-1.2\). The floor function \(\lfloor y\rfloor\) gives the greatest integer less than or equal to \(y\). Therefore, \(\lfloor -1.2\rfloor=-2\), so the correct answer is -2. Exam tip: for a negative decimal, the floor is the next lower integer, not the integer obtained by simply dropping the decimal part.

Related tags

Standard-FunctionsGreatest-Integer-FunctionNegative-NumbersRelations-And-FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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