need your help!

[laureenpouur]

Hello, I have been stuck on this question for two days now and I don't get how to solve this. Please help!! I'm going to be super thankful.

if x = 100^1999 and y = 100^-1999, then(x + y)^2 - (x-y)^2 =

 

[Dr.Peterson]

Hello, I have been stuck on this question for two days now and I don't get how to solve this. Please help!! I'm going to be super thankful.

if x = 100^1999 and y = 100^-1999, then (x + y)^2 - (x-y)^2 =

I suggest you hold off on using the numbers, and first simplify the expression (x + y)^2 - (x-y)^2 by expanding the squares. That will make the rest very easy!