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What constant value does the graph y=|x|-|x-2| have for x≥2?

Answer and explanation

Correct answer: 2

The governing concept is piecewise evaluation of absolute values using the sign of each expression. For x≥2, both x and x−2 are nonnegative. Therefore |x|=x and |x−2|=x−2. Substitute these forms into the function: y=x−(x−2)=x−x+2=2. The variable terms cancel for every x in the stated interval, so the graph is horizontal there and has the constant value 2. Thus option C is correct. Option A would follow from assigning an incorrect negative sign to the second absolute value. Option B loses the remaining constant term. Option D stops before simplification and incorrectly leaves a variable expression, even though the x terms cancel completely.

Related tags

Absolute-ValueGraphsPiecewise-FunctionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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