(i) 4z2 - x2 + 4xy - 4y2
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x
2
+4xy−4z
2
+4y
2
=x
2
+4xy+4y
2
−4z
2
=x
2
+2.x.2y+(2y)
2
−(2z)
2
=(x+2y)
2
−(2z)
2
=(x+2y+2z)(x+2y−2z).
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