Expand .

5

If p = 2 – a. Prove that a³ + 6ap + p³ – 8 = 0

6

Expand (– 2x + 5y – 3z)².

7

Using suitable identity multiply:

9x² + 25y² + 15xy + 12x – 20y + 16 by 3x – 5y – 4

8

p³ – q³ if and .