The perimeter of a rectangle is twice the sum of its length and its width. The perimeter is 28 meters and its length is 2 meters
more than twice it’s width.
What is it’s Length ?
What is it’s Length ?
2 answers:
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The function is not invertible if you think of it as
because it is not injective:
So, if we restrict the domain to the positive numbers only:
Note that the range is actually , so we can be more precise and write
To find the inverse, we solve the expression for x:
But since we restricted to positive values of x, the inverse is