Enrichment

Do the indicated operation.

1. Find the sum :      8x4 – 5x3 + 15x2 – 7                

                 -3x4 + 6x3 – 8x2  – 2

        14x4 + x3   –   x2  + 3

2. Find the difference:  (25m3 + 6m2 – 7m) – (9m3 + 12m2 + 4m)

3. Add: ( -4a + ab + 3b) + (2ab – 8b – 6a) + ( 3 + a – ab)

4. Subtract 30x2y – 15xy + 6y from (25x2y + 9xy – 7y).