Answer:
(a+1)(a+2)
Step-by-step explanation:
You know the factors have to look like this:
(a+x)(a+y) where x and y are real numbers.
you need to find two numbers where x+y=3 and x*y=2
these are 1 and 2.
this equals is zero if one of the factors equal zero.
a+1=0 -> a=-1
a+2=0 ->a=-2
