1.

Factorise (x + y )² - 4xy² ​

Answer»

Step-by-step EXPLANATION:

\:  = x { }^{<klux>2</klux>}  + y { }^{2}  \:   + 2xy - 4xy \\   = x  {}^{2}  + y {}^{2}  - 2xy

= (x-y)2



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