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If \(f(x)=2x-1\) and \(g(x)=x^2\), what is the value of \((f+g)(-2)\)?

Answer and explanation

Correct answer: \(-1\)

For the sum of two functions, \((f+g)(x)=f(x)+g(x)\). Thus, \(f(-2)=2(-2)-1=-5\) and \(g(-2)=(-2)^2=4\). Therefore, \((f+g)(-2)=-5+4=-1\). Option C results from incorrectly taking the sign of \(f(-2)\), while option D treats the square of \(-2\) as negative. Exam tip: evaluate each function separately before adding their values.

Related tags

Algebra Of FunctionsFunction EvaluationAddition Of FunctionsReal FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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