This web page will show you how to foil. It only takes 4 easy steps. First, Outer, Inner, and Last. I will explain these steps in detail and show you how to do these steps. Foiling is important to break down equations to the simplest form. Why I did this topic is it is very helpful for Algebra and through out school.

Here is the expression we will be working with (X-3)(X+5).

Here is examples of some thing you fight want to foil. You start with the f the FIRST which is x*x which gives you x² , second is OUTER which is x*5 which is 5x. Then we have the third step INNER which is –3*x to get –3x, then we have the last fourth step Last which is –3*5 to give you –15. You get all the answers which are x² , 5x, -3x, and –15, and you combine like terms. Which would be 5x-3x=2x.

Your expression would be x²+2x-15.

To check your work there are many different ways to do it. The one I have selected is the table method what you do is go to y= and put the original expression in y1 which is (x-3) (x+5) and the answer you got in y2 which should be x² +2x-15. Then go to your window and set it at. Then go 2^nd graph that is table and the number should match up.
 
 
 My name is Kristen and I am a senior at Fayetteville high school. I am making this web page for my nine weeks portfolio in Algebraic Connections class. If you need more help go to dyoung7@prodigy.net and I am sure Mr. Young will try his best to answer your questions.

How foiling applies to the real word is the only reason to foil is to unfoil it so you know how it works just in case something mess up your work you can fix it. Now we have computers for all of it so we don’t have to worry.

Here are some links to go to.
alg conn
book web page
solving equations by factoring
fasst
fayar
ask dr. math