Simplify (y-z)square -2yz?

1 Answer
Yiyun W.
Feb 19, 2018

#y^2 - 4zy + z^2#

Explanation:

#(y-z)^2# = #(y-z)(y-z)#
If you expand this, you get: #y^2 - zy - zy +z^2# or #y^2 - 2zy + z^2#
Then, add the #-2yz# into it and you get #y^2 - 2zy - 2zy + z^2#, which becomes #y^2 - 4zy +z^2#

Hope this helps!

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