I have a simple question regarding solving a quadratic function
I tried to solve it as follows in general for y=y1 find the roots of the quadratic equation:
Hence, in more detail...
However, this is not producing the desired result. For example, assume the following function
and following the solution above gives:
None of them being 3 as I would expect. Can someone point me in the right direction or a link with info I can look up?
Thank you in advance.