Question
Mon July 23, 2012 By:

factorise: x²+4y²-z²-4xy

Expert Reply
Mon July 23, 2012
x² + 4y² – z² – 4xy 
= (x² + 4y² – 4xy) – z²
= (x – 2y)² – z²
= (x – 2y + z)(x – 2y – z) 
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