Mathematics
(i) What should be added to 7a - 9b + 13c to get 9a + b - c?
(ii) What should be added to 1 + 2x - 3x2 to get x2 - x - 1?
(iii) What should be added to m2 - 2mn + 5n2 to get n2 + mn - m2?
Related Questions
(i) Subtract 6x3 - 5x2 + 4x - 3 from the sum of x + 2x2 - 3x3 and 2 - x2 + 6x - x3.
(ii) Subtract the sum of a + 2b - 3c and 2c - 3b - 4a from the sum of 5b - 4c + a and 2c - 3b - 4a.
(iii) Subtract the sum of x2 - 5xy + 2y2 and y2 - 2xy - 3x2 from the sum of 6x2 - 8xy - y2 and 2xy - 2y2 - x2.
(i) What should be subtracted from x + 2y - 3z to get 3x - 2y + z?
(ii) What should be subtracted from 2x2 - y2 + 4z2 to get x2 + y2 - z2?
(iii) What should be subtracted from 1 + x - x2 to get 2x + x2?
Find the excess of 4p2 - 2pq + 3q2 over 2p2 - pq + 4q2.
By how much does 3x3 - 5x2 + 2x - 3 exceed 2x3 - 3x2 + x + 1?