Assertion (A): Factorisation of 4x² + 9y² is (2x - 3y)(2x + 3y).

Reason (R): a² - b² = (a - b)(a + b)

1. Assertion (A) is true, Reason (R) is false.

2. Assertion (A) is false, Reason (R) is true.

3. Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct reason (or explanation) for Assertion (A).

Assertion (A): Factorisation of x³ - 27 is (x - 3)(x² + 3x + 9).

Reason (R): a³ - b³ = (a - b)(a² + ab + b²).

1. Assertion (A) is true, Reason (R) is false.

2. Assertion (A) is false, Reason (R) is true.

3. Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct reason (or explanation) for Assertion (A).

Factorise the following:

a(b - c)(b + c) - d(c - b)

Factorise the following:

2a²x - bx + 2a² - b