Factorisation of 63x² - 112y² is

1. 63(x - 2y)(x + 2y)

2. 7(3x + 2y)(3x - 2y)

3. 7(3x + 4y)(3x - 4y)

4. none of these

Factorisation of p⁴ - 81 is

1. (p² - 9)(p² + 9)

2. (p - 3)(p + 3)(p² + 9)

3. (p - 3)²(p + 3)²

4. none of these

Factorisation of x² - 4x - 12 is

1. (x + 6)(x - 2)

2. (x - 6)(x + 2)

3. (x - 6)(x - 2)

4. (x + 6)(x + 2)

Factorisation of 3x² + 7x - 6

1. (3x - 2)(x + 3)

2. (3x + 2)(x - 3)

3. (3x - 2)(x - 3)

4. (3x + 2)(x + 3)