Question

What is FOIL?

Answer 1

It's a rule.

Explanation:

It's a rule commonly used in factoring, meaning to start by multiplying the two first variables first, then outer, then inner, then last.
Ex:
If the things being multiplied is (x+1) by (x-2), you would multiply "x" and "x" first.
`x*x=x^2`
`x*-2=-2x`
`1*x=x`
`1*-2=-2`
The final answer would be: `x^2-x-2`