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If f(x) = x − 5, what is f⁻¹(x)?

Answer and explanation

Correct answer: x + 5

The governing concept is finding an inverse function by interchanging the input and output and solving for the original input. Let y = f(x) = x − 5. Add 5 to both sides: y + 5 = x, or x = y + 5. To express the inverse in the usual variable x, replace y by x. Thus f⁻¹(x) = x + 5, which is option A. Option B repeats the original function rather than reversing it. Option C changes the sign incorrectly and would represent 5 − x, while option D multiplies by 5 instead of undoing the subtraction. A quick check confirms the result: f(f⁻¹(x)) = (x + 5) − 5 = x.

Related tags

Inverse FunctionLinear FunctionAlgebraFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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