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If f(x) = 2x² − 3 and g(x) = x² + 5, what is the value of (f − g)(x)?

Answer and explanation

Correct answer: x² − 8

For the difference of two functions, (f − g)(x) = f(x) − g(x). Hence, (f − g)(x) = (2x² − 3) − (x² + 5) = 2x² − x² − 3 − 5 = x² − 8. Option B results from effectively adding the functions, so it is incorrect. In exams, remember to subtract the entire g(x), including the constant term.

Related tags

Relations And FunctionsAlgebra Of FunctionsPolynomial FunctionsFunction SubtractionAlgebra Of Real FunctionsMathematicsClass 11 Mcq

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