(i) (a + b)2 - 5a - 5b + 6
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✏ (a + b) 2 - 5a - 5b + 6
✏ 2a + 2b - 5a - 5b +6
✏ [ 2a - 5a] + [ 2b - 5b] +6
✏ (-3a) + ( - 3b) + 6
✏ Hence, the answer is
= 6 - 3a - 3b.
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