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If \(f(x)=|x|\) and \(g(x)=x\), what is the value of \((f-g)(-5)\)?

Answer and explanation

Correct answer: 10

By the definition of subtraction of functions, \((f-g)(x)=f(x)-g(x)\). Hence, \((f-g)(-5)=|-5|-(-5)=5+5=10\). Option B is incorrect because the two function values are not equal. Exam tip: \(|-5|=5\), while \(g(-5)=-5\); do not replace the latter by its absolute value.

Related tags

FunctionsSubtraction Of FunctionsAbsolute ValueReal FunctionsEvaluationAlgebra Of Real FunctionsRelations And FunctionsMathematics

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