How to us the foil method for x2 + 16x + 48

F irst

O uters

I nners

L ast

We first need to expand the equation By finding what adds up to 16 and multiples to 48

X^2 + 16x + 48 = x^2 + 12x + 4x + 48.

According to the foil method

(a + b) (c + d) = ac + ad + bc + bd

ac = x^2

ad = 12x

bc = 4x

bd = 48.