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If \(f(x)=x^2-4\) and \(g(x)=x^2+4\), what is \((f+g)(x)\)?

Answer and explanation

Correct answer: \(2x^2\)

The sum of two functions is defined by \((f+g)(x)=f(x)+g(x)\). Thus, \((f+g)(x)=(x^2-4)+(x^2+4)=2x^2\), since \(-4\) and \(+4\) cancel each other. Option D incorrectly retains an extra constant term. Exam tip: add like terms separately when combining functions.

Related tags

AlgebraReal FunctionsPolynomial AdditionFunction OperationsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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