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If \(f(x)=2x^2\) and \(g(x)=3x^2\), what is the value of \((5f-2g)(x)\)?

Answer and explanation

Correct answer: \(4x^2\)

Using the rule for a linear combination of functions, \((5f-2g)(x)=5f(x)-2g(x)\). Therefore, \(5(2x^2)-2(3x^2)=10x^2-6x^2=4x^2\), so option A is correct. Option B represents only \(5f(x)\) and ignores the subtraction of \(2g(x)\). In an exam, apply the coefficients first and then combine like terms.

Related tags

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

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