How do you solve a problem like this one 18x^2-15x-18

Ok so this one can be factored like this first:

3 (6x^2-5x-6)

Then you have to factor like you normally would for a complex one:

(Put aside the 3 for now just know it's there to make the problem easier)

6x^2-9x+4x-6

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

Adding the 3 put aside now

3 (3x+2) (2x-3) is the final factored answer

Solve the problem by factoring, the answer would be: 3 (3x+2) (2x-3)