Question

factorise : 4xy-x^2-4y^2+z^2

Answer 1

4xy-x^2-4y^2+z^2
-(-4xy+x^2+4y^2)+z^2
-(x-2y)^2 +z^2
z^2-(x-2y)^2
(z-x+2y)(z+x-2y) [a^2-b^2 =(a-b)(a+b)]

Answer 2

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