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

Answer and explanation

Correct answer: \(x^2-3\)

By the definition of subtraction of functions, \((g-f)(x)=g(x)-f(x)\). Therefore, \((g-f)(x)=(2x^2-1)-(x^2+2)=2x^2-1-x^2-2=x^2-3\), so option A is correct. Option C results from mishandling the signs of the constants, while option B is the result of addition, \((f+g)(x)\). Exam tip: in \(g-f\), write \(g\) first and subtract the entire expression for \(f\).

Related tags

Relations And FunctionsAlgebra Of Real FunctionsFunction SubtractionSign RulesClass 11 MathematicsMathematicsClass 11 Mcq

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