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2014-08-08T09:39:21+07:00
(4x + 3y)(cx + dy) = 4cx^2 +4dxy + 3cxy + 3dy^2 = 4cx^2 +(4d + 3c)xy + 3dy^2

3d = 6, d = 2

4d + 3c = 23
8 + 3c = 23
c= 5


4c = e, e = 20
1 5 1
2014-08-08T14:51:48+07:00