Explain : special products of binomials and you

There are different types of special products from binomials. 

One is multiplying a binomial by itself, which would be like . That can be easily reduced to (a+b)(a+b) and then distributed out by FOIL. 

Another would be multiplying a subtract by a subtract. Like . That can be reduced to (a-b)(a-b) and then FOILed out. 

And the last one would be the difference of squares. It's called that because (a+b)(a-b) can be FOILed out to be . And that is a difference of squares. 

Comment if you still have any other questions :)

The answer is: a = about 63.59ft2 for 15