Answer:
(x+2)(x+4)
Explanation:
First, start by combing like terms so that you end up with x^2 + 6x + 8
Now, we have to come up with two factors of this equation
(x + a)(x + b) = x^2 + 6x + 8
we know that ab = 8 and that a+b = 6. In other words, what factors of 8 have a sum of 8? We can find out that 2 and 4 fit these criteria.
a = 2
b = 4
2(4) = 8? 2 + 4 = 6?
8 = 8 6 = 6