Step-by-step explanation:
[tex]18 {v}^{2} - 15v - 18 \\ = 3(6 {v}^{2} - 5v - 6) \\ = 3 \{6 {v}^{2} - 9v + 4v - 6 \} \\ = 3 \{3v(2 {v} - 3) +2( 2v - 3) \} \\ = 3(2v - 3)(3v + 2)[/tex]
