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If f(x)=x² and g(x)=x+1, what is (f+g)(a)?

Answer and explanation

Correct answer: a²+a+1

The governing definition of the sum of two functions is (f+g)(x)=f(x)+g(x). With f(x)=x² and g(x)=x+1, we first form the sum: (f+g)(x)=x²+(x+1)=x²+x+1. To find its value at a, replace x by a, giving (f+g)(a)=a²+(a+1)=a²+a+1. Therefore option A is correct. Option B omits the term a, while option C omits the constant 1. Option D, 2a+1, incorrectly treats the expressions as though only their linear parts should be combined and ignores the square term from f. The operation is addition of function values, not multiplication or addition of coefficients alone. Keeping the definition explicit prevents these omissions and confirms the result.

Related tags

Addition Of FunctionsAlgebra Of Real FunctionsFunction EvaluationPolynomialsMathematicsRelations And FunctionsClass 11 Mcq

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