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

Answer and explanation

Correct answer: \(2px\)

\((f-g)(x)=f(x)-g(x)=(x^2+px+1)-(x^2-px+1)\). The like terms \(x^2\) and the constants \(1\) cancel, while \(px-(-px)=2px\). Hence, the correct answer is \(2px\). Option D results from mishandling the minus sign before \(-px\). Exam tip: when subtracting functions, distribute the minus sign to every term of the second function.

Related tags

Relations And FunctionsAlgebra Of Real FunctionsFunction DifferencePolynomial FunctionsMathematicsClass 11 Mcq

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