This is a repeat question. I admit I cannot find the original though.
I do not think it was answered.
Melody I found one of the originals it is https://web2.0calc.com/questions/an-advanced-quadratics-problem however it is wrong but I don't see what went wrong in the work.
I have commented on Heureka's original answer:
https://web2.0calc.com/questions/an-advanced-quadratics-problem
Any further content should go on the orginal thread. Thanks.
Just leave a small comment on this thread saying you have added to the other one.
Ok Everyone that has looked at this the answer is on the original