The value of (0.8)² - 0.32 + (0.2)² is equal to:

1. 1

2. 3.6

3. 0.36

4. 0.036

The value of (a - b - c)(a - b + c) is:

1. a² + b² + c² + 2ab

2. a² + b² - c² - 2ab

3. a² + b² + c² - 2ab

4. a² + b² - c² + 2ab

Use direct method to evaluate the following product:

(b - 3) (b - 5)

Use direct method to evaluate the following product:

(3x - 2y) (2x + y)