Assertion (A) : There are two values of b so that x² + bx - 24 is factorisable.

Reason (R) : Two values have:

Product = -24 and sum = 2.

1. Both A and R are correct, and R is the correct explanation for A.

2. Both A and R are correct, and R is not the correct explanation for A.

3. A is true, but R is false.

4. A is false, but R is true.

Factorise :

6x³ - 8x²

Factorise :

8(2a + 3b)³ - 12(2a + 3b)²

Factorise :

9a(x - 2y)⁴ - 12a(x - 2y)³