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pan90
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Can anyone explain the logic behind the answer?
View attachment 9221
Taken from HiSet free practice test
View attachment 9221
Taken from HiSet free practice test
An inverse function is a function that undoes the action of another function. In other words, if a function f(x) takes an input x and produces an output y, then the inverse function f^-1(y) takes the output y and produces the original input x.
To find the inverse of a function, you need to switch the input and output variables and solve for the new output. This can be done algebraically by swapping the x and y variables and solving for y, or graphically by reflecting the function over the line y=x.
The relationship between a function and its inverse is that they "undo" each other. This means that the composition of a function and its inverse will result in the original input. In other words, f(f^-1(x)) = x and f^-1(f(x)) = x.
Reflecting a function over the line y=x allows you to find its inverse function. This is because the line y=x represents the "mirror" between a function and its inverse, and reflecting over this line essentially swaps the input and output variables.
No, not every function has an inverse. A function must be one-to-one (each input has a unique output) in order to have an inverse. Functions that fail the horizontal line test (where a horizontal line intersects the function more than once) do not have an inverse.