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If f(x) = 1 and g(x) = x² − 2x, what is (fg)(x)?

Answer and explanation

Correct answer: x² − 2x

The governing operation is multiplication of real-valued functions, defined by (fg)(x) = f(x)g(x). Substituting the given functions gives (fg)(x) = 1·(x² − 2x) = x² − 2x. The constant function 1 acts as the multiplicative identity, so it leaves g(x) unchanged for every x in the common domain. Option B would result from adding 1 instead of multiplying; option C confuses the product with f alone; and option D changes the sign of the linear term without justification. Since both functions are defined for every real x, there is no additional domain restriction. Therefore option A is correct.

Related tags

Algebra-Of-FunctionsFunction-ProductIdentity-ElementAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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