7. Factorize.
(ii) 4a2 - 12ab + 9b2 - 16c2
1) a? +962 - 6ab – 25x2
(iv) (a + 3)2 - 10(a + 3) + 25
(vii) 4a - 64
(ii) (a + 2b)2-9c-
(vi) 64 - x - y2 - 2xy
(v) 81 - 4x2 - 9y2 + 12xy
(viii) x2 - y2 + 10yz - 25z2
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