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If f(x)=|x−2| and g(x)=x−2, for which x is (f−g)(x)=0 true?

Answer and explanation

Correct answer: x ≥ 2

The governing concept is piecewise evaluation of an absolute-value function. We need (f−g)(x)=|x−2|−(x−2)=0, which is equivalent to |x−2|=x−2. If x≥2, then x−2 is non-negative, so |x−2|=x−2 and the difference is zero for every value in this interval. If x<2, then |x−2|=−(x−2)=2−x, and the difference becomes (2−x)−(x−2)=4−2x. For x<2 this expression is positive, not zero. The boundary value x=2 is included in x≥2 and gives f(2)=g(2)=0. Hence the complete solution set is x≥2, making option A correct. Option B excludes all valid values above 2, option C includes only the boundary point, and option D incorrectly includes the negative-side interval.

Related tags

Absolute-ValueFunctionsAlgebra-Of-FunctionsPiecewise-EvaluationAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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