Subtract the sum of `2a+3b,a-2b+c,-a+2c` and `4a+2b-5` from `6a-4b+8`

Subtract the sum of a-b +c and a+b -2c from 3a + 3b + 3c

Subtract the sum of a+2b-3c and 2c-3b-4a from the sum of 5b-4c+a and 2c-3b-4a .

Subtract 3a−2b+4c from the sum of −2a+b−5c and 3a−2b+c

Subtract 6a+7b-2c from the sum of 4a+2b+3c and 2a-4b+5c

If a,b and c are non-coplanar vectors, then prove that the four points 2a+3b-c,a-2b+3c,3a+4b-2c and a-6b+6c are coplanar.

If a,b and c are non-coplanar vectors, then prove that the four points 2a+3b-c,a-2b+3c,3a+4b-2c and a-6b+6c are coplanar.

Subtract (2a - 3b + 4c) from the sum of (a + 3b - 4c), (4a - b +9c) and (-2b + 3c -a )

Subtract 3a+4b-2c from 3c+6a-2b.

Subtract: 3a+4b-2c from 6a-2b+3c .