Question 840388
{{{N^2+(N+1)^2-13=100}}}
{{{N^2+N^2+2N+1-13=100}}}
{{{2N^2+2N-12=100}}}
{{{2N^2+2N-112=0}}}
{{{N^2+N-56=0}}}
{{{(N-7)(N+8)=0}}}
Two solutions:
{{{N-7=0}}}
{{{N=7}}}
7 and 8.
{{{N+8=0}}}
{{{N=-8}}}
-8 and -7.