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If f(x) = |x| and g(x) = x, what is (f − g)(−3)?

Answer and explanation

Correct answer: 6

The governing concept is pointwise subtraction of functions: (f − g)(a) = f(a) − g(a). The modulus function gives the non-negative distance of a number from zero, so f(−3) = |−3| = 3. Since g(x) = x is the identity function, g(−3) = −3. Substituting these values, (f − g)(−3) = 3 − (−3) = 3 + 3 = 6. Therefore option A is correct. Option D is only f(−3), not the requested difference. Option B would incorrectly treat the two function values as equal, while option C results from failing to apply the rule that subtracting a negative number changes subtraction into addition. The modulus sign must be evaluated before performing the subtraction.

Related tags

Relations-FunctionsModulus-FunctionFunction-SubtractionMathematicsAlgebra Of Real FunctionsRelations And FunctionsClass 11 Mcq

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