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

Answer and explanation

Correct answer: \(2x\)

The difference of two functions is \((f-g)(x)=f(x)-g(x)\). Thus, \((x^2+x+1)-(x^2-x+1)=x^2+x+1-x^2+x-1=2x\). Option B results from failing to change the sign of the \(-x\) term when subtracting the entire function \(g(x)\). Exam tip: when a function is preceded by a minus sign, change the sign of every term inside its brackets.

Related tags

Relations And FunctionsAlgebra Of FunctionsFunction SubtractionPolynomialsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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