The sum and product of two integers are $26$ and $165$ respectively. The difference between these two integers is ______

1. $2$
2. $3$
3. $4$
4. $6$

edited

x+y=26

x*y=165

x*(26-x)=165

$26x-x^{2}=165$

$x^{2}-26x+165=0$

so x=15,11