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If \(f(x)=3x+8\) and \(g(x)=3x-8\), what is the value of \((f-g)(x)\)?

Answer and explanation

Correct answer: \(16\)

The difference of two functions is defined by \((f-g)(x)=f(x)-g(x)\). Thus, \((f-g)(x)=(3x+8)-(3x-8)=3x+8-3x+8=16\). Therefore, 16 is correct. The expression \(6x+16\) would result from adding the two functions, not subtracting them. Exam tip: when a minus sign precedes parentheses, change the sign of every term inside.

Related tags

AlgebraReal FunctionsFunction SubtractionLinear FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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