Question

What factorization is modeled below?

x2 + 4x + 3 = (x + 4)(x + 3)
x2 + 7x + 12 = (x + 4)(x + 3)
x2 + 7x + 12 = (x + 7)(x + 12)
x2 − 7x − 12 = (x + 4)(x + 3)

Answer 1

`x^2+7x+12 = \left(x\:+\:4\right)\left(x\:+\:3\right)`

Second choice

Explanation:

If you multiply (x + 4)(x + 3) we get
x(x + 3) + 4(x + 3)

= x² +3x + 4x + 3 · 4

= x² + 7x + 12
Second choice