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If \\(f(x)=5x\\) and \\(g(x)=x+1\\), what is the value of the product of the functions, \\( (fg)(3) \\)?

Answer and explanation

Correct answer: 60

The product of two functions is defined by \\( (fg)(x)=f(x)g(x) \\). Thus, \\(f(3)=15\\) and \\(g(3)=4\\), so \\( (fg)(3)=15\\times4=60\\). The value 45 can result from incomplete or incorrect calculation, whereas both function values must be multiplied. Exam tip: do not confuse \\(fg\\) with composition \\(f\\circ g\\); here it denotes the product of functions.

Related tags

AlgebraReal FunctionsProduct Of FunctionsFunction ValuesAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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