Question

I don't understand what the difference of squares is, what is it, and why and when do you use it?

Answer 1

Here's an example
\[\huge~\rm~\bf~x^2-25\]
Basically what we want to do is square root it so we get a solution that looks like this
(a+b)(a-b) <---in this form
\[\huge~\rm~\bf~\sqrt{x^2}-\sqrt{25}\]
When you square root this you get
(x+5)(x-5)
To check if you have done it right simply foil the answer

Answer 2

This might be very useful to you :)
http://www.mathsisfun.com/algebra/special-binomial-products.html

Answer 3

Thank you!