D) x+3
Examining the trinomial
x² +5x +6
2) Let's factor out, since a = 1, asking which 2 numbers whose sum is 5 and whose product is 6?
S = 2 +3 = 5
P = 2 x 3 = 6
Then we can rewrite it:
x² +5x +6 = (x+2)(x+3)
3) Examining the options the answer is: D, x+3