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If \(f(x)=x+4\) and \(g(x)=4-x\), what is the product function \((fg)(x)=f(x)g(x)\) equal to?

Answer and explanation

Correct answer: \(16-x^2\)

For the product of two functions, \((fg)(x)=f(x)g(x)\). Thus, \((fg)(x)=(x+4)(4-x)=4^2-x^2=16-x^2\), using the identity \((a+b)(a-b)=a^2-b^2\). Option B has the sign reversed. In an exam, first check whether \(fg\) denotes the product of functions or their composition.

Related tags

Real FunctionsProduct Of FunctionsAlgebraic IdentitiesRelations And FunctionsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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