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What is the value of (f(x)=\lfloor 2x\rfloor) at (x=1.4)?

Answer and explanation

Correct answer: (2)

The direct answer is A, 2. First substitute x=1.4 into the inside expression: \(2x=2(1.4)=2.8\). The floor symbol \(\lfloor t\rfloor\) means the greatest integer that is less than or equal to t. Since 2 is the greatest integer not exceeding 2.8, \(\lfloor2.8\rfloor=2\). Option A is correct. Option B, 3, is wrong because 3 is greater than 2.8, so it is not allowed by the floor definition. Option C, 2.8, is the value before applying the floor operation, not the function value. Option D, 1, is too small and is not the greatest integer at most 2.8. For a positive decimal, floor means remove the decimal part, but always check the definition, especially for negative numbers.

Related tags

Standard-FunctionsGreatest-Integer-GraphNumerical

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