hasil (3 - a)(3a + 4)(a - 5) = .....
(3-a)(3a+4)(a-5)=(9a+12-3a^2-4a)(a-5) =(5a+12-3a^2)(a-5) =5a^2-25a+12a-60-3a^3-15a^2 =-10a^2-13a-60-3a^3 =10a^2+13a+60+3a^3hopefully this helps :)