Hi ! First post here !
I'm having some difficulty with a math problem in my math book and I'm starting to think the author made a mistake.
I'm trying to factorize using the "difference of the squares" technique. According to my book, it should result in the following factors :
Now, if I multiply those two factors together, it gives me this :
so, I'm tempted to conclude that does not equal , and therefore that my book is wrong about it.
Am I right ? Did I make a mistake ?
My understanding of all this is a bit fragile for the moment. Why would I chose to use two variables together or independently ?