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If \(f(x)=2x\), \(g(x)=x+3\), and \(h(x)=x-1\), what is \((f+g-h)(x)\)?

Answer and explanation

Correct answer: \(2x+4\)

The algebraic combination of functions is evaluated pointwise: \((f+g-h)(x)=f(x)+g(x)-h(x)=2x+(x+3)-(x-1)\). On removing the brackets, \(2x+x+3-x+1=2x+4\), so option A is correct. Option B results from combining the \(x\)-terms incorrectly. Exam tip: change the sign of every term inside a function that is being subtracted.

Related tags

Relations And FunctionsAlgebra Of FunctionsFunction OperationsLike TermsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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