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What is the range of (f(x)=\frac{1}{|x+3|+2})?

Answer and explanation

Correct answer: ( (0,\frac{1}{2}] )

The direct answer is A: the range is \\( (0,1/2] \\). Since an absolute value is never negative, \\( |x+3|\ge0\\), so the denominator satisfies \\( |x+3|+2\ge2\\). Therefore \\(0<f(x)\le1/2\\). Equality \\(1/2\\) occurs at x=-3, so the upper endpoint is included. The denominator can become arbitrarily large as x moves far from -3, so the fraction approaches 0, but it never equals 0; hence 0 is excluded. A is correct. B incorrectly includes 0. C reverses the behavior and says values start at 1/2 and increase without bound, but the reciprocal decreases as the denominator grows. D has the wrong upper bound 2; even at the smallest denominator the value is only 1/2. Memory cue: a positive reciprocal of a quantity at least 2 lies between 0 and 1/2, with 0 usually only approached.

Related tags

Real-Valued-FunctionsRangeModulusRational

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