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If f(x) = x + 6 and g(x) = x − 2, what is the expression for (fg)(x)?

Answer and explanation

Correct answer: x² + 4x − 12

The product of two real functions is defined by (fg)(x) = f(x)g(x). Hence, (fg)(x) = (x + 6)(x − 2) = x² + 4x − 12. Option C has an incorrect coefficient for the middle term. Exam tip: distinguish (fg)(x), which denotes the product, from f(g(x)), which denotes composition.

Related tags

AlgebraReal FunctionsFunction ProductRelations And FunctionsAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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