The answer is 27, but I might be wrong
is there more to this question
Ok i will give you a hint ok look subtract 18-30 then you will get yhe answef for 8× ok try it

Break the expression into group:

factor out x from 4x² - 5x : x (4x-5)
factor out 3 from 12x-15 : 3 (4x-5)

factor out common term (4x-5) :

hope this helps!