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If f(x)=x+3 and g(x)=2x−6, what is (fg)(0)?

Answer and explanation

Correct answer: −18

Here (fg)(x) denotes the product of the two functions, so (fg)(0)=f(0)g(0). First evaluate each function at the given input: f(0)=0+3=3 and g(0)=2(0)−6=−6. Hence (fg)(0)=3×(−6)=−18, making option A correct. Option B has the correct magnitude but loses the negative sign. Option C could arise from using only part of one expression or from an incorrect arithmetic step, and option D would be the result of mistakenly treating the product as a sum or assuming one factor is zero. The important rule is that function multiplication is evaluated by finding both function values at the same input and then multiplying those values.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsFunction-ProductAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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