Expand :
(i) (x - 2y + 6)(x - 2y - 6).
(ii) (2a - 4b + 7) (2a + 4b + 7).
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Expand : (2x - y + 2)3
If a + b = 1 and a - b = 7; find:
(i) a2 + b2
(ii) ab