3. Subtract using the column method
(i) 5a +3b - 4c from Ila-b-c
(ii) -5x2 + 2x + 1 from x? -*-5
(iii) 3aa-2b2-7c from Ila?
+7b2-9c2
(iv) 12x2 +3y2 - 11z2 from 7x2 -9y2 - 11z
(v) -3ab + 4bc-6ca from 2ab +13bc +6ca
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