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What is the inverse of the function f(x) = x − 4?

Answer and explanation

Correct answer: f⁻¹(x) = x + 4

The governing concept is finding an inverse by interchanging the input and output and solving for the original input. Write y = x − 4. To express x in terms of y, add 4 to both sides: x = y + 4. Now interchange the variable names, replacing y by x, to obtain f⁻¹(x) = x + 4. Therefore option A is correct. The inverse must undo the subtraction of 4, so it adds 4. Option B is the original function rather than its inverse; option C changes the sign of the variable unnecessarily, and option D represents multiplication by 4, not reversal of the given operation. Composition also confirms the result: f(f⁻¹(x)) = (x + 4) − 4 = x.

Related tags

Inverse FunctionLinear FunctionFunction OperationsFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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