Помогите пожалуйста.

Решите задачу:

$12 {x}^{4} {y}^{4} - 75 {x}^{2} {y}^{2} + 4 {x}^{3} {y}^{5} - 25x {y}^{3} = (12 {x}^{4} {y}^{4} + 4 {x}^{3} {y}^{5}) - (75 {x}^{2} {y}^{2} + 25x {y}^{3} ) = 4 {x}^{3} {y}^{4} (3x + y) - 25x {y}^{2} (3x + y) = (3x + y)(4 {x}^{3} {y}^{4} - 25x {y}^{2} ) = (3x + y) \times x {y}^{2} (4 {x}^{2} {y}^{2} - 25) = x {y}^{2} (3x + y)(2xy - 5)(2xy + 5)$