Question

Solve 9and20 with step by step explanation. do with process​

Answer 1

9) Let the number to be added = x

a³ - b³ + x = -2b³

x = -2b³ - a³ + b³

x = -2b³ + b³ - a³

x = - b³ - a³

10) Let the number to be subtracted = x

- 10ab²c - x = 4ab²c

- x = 4ab²c + 10ab²c

- x = 14ab²c

x = - 14ab²c