Question 263129
n^2 + 11n +18
The factors of 18 are:
1 & 18 the sum=19
-1 & -18 the sum is=-19
2 & 9 the sum is=11 [the only factors that match the middle term.]
-2 & -9 the sum is=-11
3 & 6 the sium is=9
-3 & -6 the sum is=-9 
(n+2)(n+9) ans.