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If \(f(x)=x+2\) and \(g(x)=x-5\), what is the value of \((fg)(x)\)?

Answer and explanation

Correct answer: \(x^2-3x-10\)

Here, \((fg)(x)\) denotes the product of the two functions: \((fg)(x)=f(x)g(x)=(x+2)(x-5)=x^2-5x+2x-10=x^2-3x-10\). Option D, \(2x-3\), is \(f(x)+g(x)\), the sum rather than the product. Exam tip: distinguish \((fg)(x)\), which means a product, from \(f(g(x))\), which means composition.

Related tags

Relations And FunctionsAlgebra Of FunctionsProduct Of FunctionsPolynomial ExpansionAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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