Question

How do you factor `x^2+ 4x + 3`?

Answer 1

(x + 1)(x + 3)

Explanation:

Since a - b + c = 0, use shortcut:
The 2 real roots are: -1 and -c/a = -3.
The 2 factor are: (x + 1) and (x + 3)
y = (x + 1)(x + 3)