Sum and Product of roots

HI guys today in the class today in the class we learned how to use formula of
Ax2+Bx+C = 0
In this Bx is the sum of two numbers, whose product is same as "C" value.
So to solve these kind of questions first of all we find two numbers that add or or minus to give us same as same value as "C" and product of those numbers will be same as "C".
For example:
show that 2 and 3 are the roots of






x=2,3 proves that these are the roots of this equation

I hope you guys will get what I tried to tell you here....
So have a good night .....