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If (f:\mathbb{R}\to\mathbb{R}) and (f(x)=|x+2|+|x-4|), what is the range?

Answer and explanation

Correct answer: ([6,\infty))

The direct answer is A: the range is \([6,\infty)\). The expression \(|x+2|\) is the distance from x to -2, and \(|x-4|\) is the distance from x to 4. The distance between -2 and 4 is 6. If x lies between these points, the two distances add to exactly 6: for \(-2\le x\le4\), \(|x+2|+|x-4|=(x+2)+(4-x)=6\). Outside this interval, moving farther away increases the sum, so values larger than 6 occur. Hence the minimum is 6 and every value from 6 upward is possible; the range is \([6,\infty)\). Option A is correct. Option B incorrectly allows values below the minimum, including 0. Option C gives only the minimum, not all possible values. Option D includes values at most 6 and even negative values, impossible because absolute values are nonnegative. Memory cue: a sum of distances is at least the distance between the fixed points.

Related tags

Modulus FunctionRangeInterval

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