Factorise: (i) 25a4
-40a2+16
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Answer:
25a4-40a2+16
(5a2)2 + (4)2 -40a2
(5a2-4)2 +40a2-40a2
(5a2-4)2 + 02
(5a2-4+0) (5a2-4-0)
(5a2-4)2
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