The sum of (6a + 4b - c + 3), (2b - 3c + 4), (11b - 7a + 2c - 1) and (2c - 5a - 6) is

Add: 6a + 8b - 5c, 2b + c - 4a and a - 3b - 2c.

If a : b = c : d , prove that : (6a + 7b) (3c - 4d) = (6c + 7d) (3a - 4b) .

If a, b, c, d satisfy the equation a + 7b + 3c + 5d = 0 , 8a + 4b + 6c + 2d = - 16 , 2a + 6b + 4c + 8d =16 and 5a + 3b + 7c + d = -16 then the value of (a + d) (b + c) =______

The points 2a + 3b + c, a + b, 6a + 11b + 5c are

Find the sum of the following algebraic expressions : 3a - 4b + 5c , 2a + 3b - 6c , - 5a + 8b + 7c

Let U = { 1, 2, 3, 4, 5, 6, 7, 8, 9 }, A = { 1, 2, 3, 4}, B = { 2, 4, 6, 8 } and C = { 3, 4, 5, 6 }. Find:- (B -C)'