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If \(f(x)=x+4\) and \(g(x)=x-4\), which algebraic identity is useful for simplifying \((fg)(x)=f(x)g(x)\)?

Answer and explanation

Correct answer: \(a^2-b^2\)

Here, \((fg)(x)=f(x)g(x)=(x+4)(x-4)\). This matches the identity \((a+b)(a-b)=a^2-b^2\), with \(a=x\) and \(b=4\), giving \(x^2-16\). Options B and C represent the sum of squares and \((a-b)^2\), respectively, so they do not apply. Exam tip: whenever conjugate binomials appear, look for the difference-of-squares identity.

Related tags

Algebraic IdentitiesReal FunctionsProduct Of FunctionsDifference Of SquaresAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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