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

Answer and explanation

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

Using the algebra of functions, \((f+2g)(x)=f(x)+2g(x)\). Therefore, \(3x^2+2(2x+1)=3x^2+4x+2\), so option A is correct. In option C, the factor 2 has not been properly distributed to \(g(x)\). In the exam, multiply the entire function \(g(x)\) by 2 before combining like terms.

Related tags

Relations And FunctionsAlgebra Of FunctionsLinear CombinationReal FunctionsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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