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If f(x) = x² + 1 and g(x) = 2x, then what is (f + g)(x) equal to?

Answer and explanation

Correct answer: x² + 2x + 1

The sum of two functions is defined as \((f+g)(x)=f(x)+g(x)\). Therefore, \((f+g)(x)=(x²+1)+2x=x²+2x+1\), so option A is correct. Option B incorrectly changes the sign of 2x. Exam tip: In function addition, add the function values at the same input x and then combine like terms.

Related tags

Relations And FunctionsFunction AdditionReal FunctionsPolynomial FunctionsClass 11 MathematicsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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