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If f(x) = x² + 3 and g(x) = 2x, what is (fg)(1)?

Answer and explanation

Correct answer: 8

The governing concept is the product of functions. In this notation, (fg)(x) means f(x)g(x), not composition, because no composition symbol is shown. Evaluate each function at x = 1: f(1) = 1² + 3 = 4 and g(1) = 2(1) = 2. The product is therefore (fg)(1) = f(1)g(1) = 4 × 2 = 8. Hence option A is correct. Option C is only f(1), and option D is only g(1), so each omits one factor. Option B may result from an incomplete or mistaken calculation and is not the product of the two values. The essential procedure is to evaluate both functions at the specified input and then multiply the resulting numbers.

Related tags

Relations-FunctionsFunction-ProductEvaluationMathematicsAlgebra Of Real FunctionsRelations And FunctionsClass 11 Mcq

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