How do you factor completely #x^2– 7x + 18#?
The given expression does not factor. Maybe these were meant?
This expression does not factor- there might be a typo perhaps?
The following are possibly what was meant?
Factors of 18 which subtract to make 7, are 9 and 2.
Factors of 18 which ADD to give 9 are 6 and 3
Hope this helps.