Q1 of 59 Page 7

Expand the following

(2a + 3b – c)2

(2a + 3b – c)2


Here the identity used is


(x + y + z)2 = x2 + y2 + z2 + 2xy + 2yz + 2zx


(2a + 3b – c)2 = (2a)2 + (3b)2 + (– c)2 + 2(2a)(3b) + 2(3b)(– c) + 2(– c)(2a)


= 4a2 + 9b2 + c2 + 12ab – 6bc – 4ca


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