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If (f(x)=x^2+1) and (g(x)=2x), which expression equals ((f+g)(x))?

Answer and explanation

Correct answer: x²+2x+1

The sum of two functions is defined by (f+g)(x)=f(x)+g(x). Hence, (f+g)(x)=(x²+1)+2x=x²+2x+1. Option B is incorrect because it subtracts 2x instead of adding it. Exam tip: For the sum of functions, add their values at the same input x.

Related tags

Relations And FunctionsAlgebra Of Real FunctionsFunction AdditionPolynomial FunctionsMathematicsClass 11 Mcq

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