What missing number would complete the factorization? v^2+12v+20=(v+10)(v+? )

V² + 12v + 20 = (v + 10) (v + ?)

First, we are going to try some low numbers and use guess and check.

Let's try 6, it is a small number, and seems good.

(v+10)(v+6)

v²+6v+10v+60

v²+16v+60

6 is too large a number, so we'll use 4.

When ?=4:

(v+10)(v+4)

v²+4v+10v+40

v²+14v+40

Once again, 4 is too large, so let's try 2.

When ?=2:

(v+10)(v+2)

v²+2v+10v+20

v²+12v+20

SO, YOUR ANSWER IS ?=2

~Hope I helped!~

(Also, guessing and checking may take some time, but it is the easiest way for me to do these types of questions.)