Example:Multiply the following: (6x+1)(2x+9)(6x+1)(2x+9)
Solution:Just follow the letters in FOIL:
First: 6x∗2x=12x^2
Outside: 6x∗9=54x
Inside: 1∗2x=2x
Last: 1∗9=9
Sum it all up and you get: 12x^2+56x+9
Solution:Just follow the letters in FOIL:
First: 6x∗2x=12x^2
Outside: 6x∗9=54x
Inside: 1∗2x=2x
Last: 1∗9=9
Sum it all up and you get: 12x^2+56x+9