Question

What is the inverse function of `y=x^2+2x-1`?

Answer 1

Inverse would be `sqrt(x+2)-1`

Write the given function as `y= (x+1)^2 -2`,
Or `(x+1)=sqrt(y+2)`
Or, x= `sqrt(y+2) -1`

Now interchange x and y, to have the inverse function y=`sqrt(x+2) -1`