Question 1187064
If you start with {{{system(A=n+5,A^2-2n=1)}}}, substitute for A, then after a few steps you can get:


{{{n^2-10n-24=0}}}

and discriminant is ,... {{{14^2}}}.


{{{n=(10+- 14)/2}}}
and one of this will work but not the other one.
You can finish.




Noelle, 12
Aya, 17