The value of (1 + x)²(1 + y²) - (1 + x²)(1 + y)² is:

1. 2(x - y)(1 + xy)

2. (x - y)(1 - xy)

3. 2(x - y)(1 - xy)

4. 2(x + y)(1 - xy)

x⁴ - y⁴ = …………… (x - y)(x² + y²)

1. 0

2. 1

3. x − y

4. x + y

Factorization of 3a(3a + 2c) − 4b(b + c) is:

1. (3a + 2b)(3a + 2b + 2c)

2. (3a − 2b)(3a − 2b + 2c)

3. (3a − 2b)(3a + 2b + 2c)

4. (3a − 2b)(3a + 2b − 2c)

12a² - 27b⁴

1. 3(2a + 3b²)(2a - b²)

2. (2a + 3b²)(2a - 3b²)

3. 3(2a + 3b²)(a - 3b²)

4. 3(2a + 3b²)(2a - 3b²)