Sbtract or add as required 5t33t22t 4t32t23t 5k5k2k4k8k11k9

Sbtract or add as required         (5t³-3t²+2t) - (4t³+2t²+3t)

5k-(5k-(2k-(4k-8k))+11k-(9k-12k)

Solution

We have (5t³ -3t² +2t) - (4t³+2t²+3t) = 5t³ -3t² +2t - 4t³ -  2t² - 3t = 5t³ - 4t³ - 3t² -  2t² + 2t - 3t = (5 -4)t³ - (3 + +2)t² + (2 -3)t = t³ - 5t² - t .

We have 5k-(5k-(2k-(4k-8k))+11k-(9k-12k) = 5k - [ 5k -{ 2k - ( 4k - 8k)} + 11k - (9k - 12k) ] = 5k - [ 5k - ( 2k - ( -4k)+ 11k - ( -3k)] = 5k - [ 2k + 4k+ 11k + 3k] = 5k - 20k = - 15k.