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

Answer and explanation

Correct answer: \(3x^2-4x+9\)

For a linear combination of functions, the coefficients multiply the entire functions: \((3f-2g)(x)=3f(x)-2g(x)=3(x^2+1)-2(2x-3)\). Simplifying gives \(3x^2+3-4x+6=3x^2-4x+9\), so option A is correct. In option C, the constant term has the wrong sign. Exam tip: distribute a negative coefficient across every term inside the parentheses.

Related tags

Relations-And-FunctionsAlgebra-Of-Real-FunctionsLinear-Combination-Of-FunctionsFunction-OperationsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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