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What constant value does the graph (y=|x-1|-|x-4|) have for (x\ge4)?

Answer and explanation

Correct answer: ( 3 )

The direct answer is option C: the constant value is 3. When x\ge4, both x-1 and x-4 are non-negative, so |x-1|=x-1 and |x-4|=x-4. Substitute these forms: y=(x-1)-(x-4)=x-1-x+4=3. Therefore the expression is constant throughout the interval x\ge4. Option C is correct. Option A has the wrong sign. Option B would mean the two absolute values cancel completely, but their difference is 3. Option D, 2x-5, results from an incorrect sign expansion and is not constant. Memory cue: first identify the interval, then remove each modulus with the correct sign.

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GraphsModulusPiecewise

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