Question

How do you combine `(x + 3)(x + 4)`?

Answer 1

You can use FOIL:

First + Outside + Inside + Last

`(x+3)(x+4) = x*x + x*4 + 3*x + 3*4`

`=x^2+4x+3x+12`

`=x^2 + (4+3)x+12`

`=x^2+7x+12`