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If \(f(x)=x+4\) and \(g(x)=2x-1\), which equation is obtained from \((f+g)(x)=(fg)(x)\)? Here, \((fg)(x)\) denotes the product of \(f(x)\) and \(g(x)\).

Answer and explanation

Correct answer: \(2x^2+7x-4=3x+3\)

First, \((f+g)(x)=f(x)+g(x)=(x+4)+(2x-1)=3x+3\). Also, \((fg)(x)=f(x)g(x)=(x+4)(2x-1)=2x^2+7x-4\). Therefore, the required equation is \(2x^2+7x-4=3x+3\). Remember that \(fg\) denotes the product of the functions here, not their composition; while expanding, the middle term is \(8x-x=7x\).

Related tags

Relations And FunctionsAlgebra Of FunctionsPointwise ProductLinear FunctionsEquation FormationAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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