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For the greatest integer function (f(x)=\lfloor x \rfloor), what is (f(-2.3))?

Answer and explanation

Correct answer: (-3)

The direct answer is option A, -3. The greatest integer function floor(x) means the greatest integer that is less than or equal to x. For -2.3, the integers near it are -3 and -2. Although -2 is numerically greater, it is not less than or equal to -2.3; in fact, -2>-2.3. The integer -3 satisfies -3≤-2.3, so floor(-2.3)=-3. Option A is correct. Option B, -2, is the number obtained by moving toward zero, but the greatest integer function is not ordinary truncation toward zero. Option C, 2, has the wrong sign and is not less than or equal to -2.3. Option D, 3, is also positive and cannot satisfy the required inequality. On a number line, the answer is the integer immediately to the left of -2.3. A common mistake is to think the answer is -2 because it is closest; closeness is not the rule. The supplied answer is correct.

Related tags

GraphsGreatest-IntegerValue

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