How do you factor #x^2+9x+18#?
By finding what multiplies to give 18 and adds to give 9.
What does multiplies to give
First is 18 positive or negative. If positive both factors will be positive or negative depending on the sign of
(Not this Question) If negative the factors will be opposite in sign.
List all the factors of
Now looking at these number intuitively what will add to give
Now place into the form:
This is the factorised version of
Quadratic Equation also works.