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If f(x) = x + 6, what is f⁻¹(x)?

Answer and explanation

Correct answer: x − 6

The governing concept is the inverse of a one-to-one linear function. Start with y = f(x) = x + 6. To isolate the original input, subtract 6 from both sides, giving x = y − 6. Now interchange the variable names in the inverse relation: f⁻¹(x) = x − 6. Therefore option A is correct. Option B is the original function, not its inverse, because it adds 6 again. Option C reverses the order and sign incorrectly, and option D multiplies by 6 without any basis in the given rule. The result can be checked directly: f(f⁻¹(x)) = (x − 6) + 6 = x and f⁻¹(f(x)) = (x + 6) − 6 = x, confirming that the two functions undo each other.

Related tags

Inverse FunctionLinear InverseFunction CompositionFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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