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If \(f(x)=x+1\) and \(g(x)=x-1\), what is the value of \((fg)(x)\)?

Answer and explanation

Correct answer: \(x^2-1\)

For the product of two real functions, \((fg)(x)=f(x)g(x)\). Therefore, \((fg)(x)=(x+1)(x-1)=x^2-1\), using the identity \(a^2-b^2=(a+b)(a-b)\). Option C, \(2x\), results from adding the functions, not multiplying them. In an exam, distinguish the product \((fg)(x)\) from the composition \((f\circ g)(x)\).

Related tags

AlgebraReal FunctionsFunction ProductRelations And FunctionsClass 11Algebra Of Real FunctionsMathematicsClass 11 Mcq

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