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Factorise :
x2 - y2 - 2yz - z2
7a5 - 567a
Factorise xy2 - xz2, Hence, find the value of :
(i) 9 x 82 - 9 x 22
(ii) 40 x 5.52 - 40 x 4.52
(a - 3b)2 - 36 b2