Find the sum of 1). 3a+4b+7c, 5a+3b-6c and 49-2b-4c
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) 3a + 4b + 7c, -5a + 3b - 6c and 4a - 2b - 4c (ii) 2x2 + xy - y2, - x2 + 2xy + 3y2 and 3x2 - 10xy + 4y2 (iii) x2 - x + 1, - 5x2 + 2x - 2 and 3x2 - 3x + 1 (iv) a2 - ab + bc, 2ab + bc - 2a2 and -3bc + 3a2 + ab (v) 4x2 + 7 - 3x, 4x - x2 + 8 and -10 + 5x - 2x2 (vi) 3x + 4xy - y2, xy - 4x + 2y2 and 3y2 - xy + 6xRead more on Sarthaks.com - https://www.sarthaks.com/169690/find-the-sum-of-i-3a-4b-7c-5a-3b-6c-and-4a-2b-4c
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