Question

Factorise : 9x ² – (3y + z) ²
1. (3x - 3y - z)(3x + 3y + z)
2. (3x - 3y + z)(3x + 3y + z)
3. (3x - 3y - z)(3x - 3y + z)
4. (3x + 3y - z)(3x + 3y + z)

Answer 1

Answer:

$9x {}^{2} -(3y + z {)}^{2}$

$(3x) {}^{2} - (3y + z {)}^{2}$

$(3x - 3y + z)(3x + 3y + z)$

option 'B' is correct