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

Answer and explanation

Correct answer: \(2x^2-13x+3\)

For a linear combination of functions, \((2f-3g)(x)=2f(x)-3g(x)\). Therefore, \(2(x^2-2x)-3(3x-1)=2x^2-4x-9x+3=2x^2-13x+3\). Hence, option A is correct. In option C, the \(x\)-terms from \(-3g(x)\) have not been combined correctly. Exam tip: Keep the entire function in parentheses when distributing a negative coefficient.

Related tags

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

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