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If \(f(x)=2x+3\) and \(g(x)=2x-3\), what is the value of the product of the functions, \((fg)(x)=f(x)g(x)\)?

Answer and explanation

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

The product of two functions is defined by \((fg)(x)=f(x)g(x)\). Therefore, \((fg)(x)=(2x+3)(2x-3)\). Using the difference-of-squares identity \((a+b)(a-b)=a^2-b^2\), we get \((2x)^2-3^2=4x^2-9\). Hence, option A is correct. Exam tip: do not confuse the product \((fg)(x)\) with the composition \((f\circ g)(x)\).

Related tags

Relations-FunctionsAlgebra-Real-FunctionsProduct-Of-FunctionsDifference-Of-SquaresAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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