Okay so from what you said it sounds like you sub each number in for x and find the answers so the first equation is
-12(2)=-24
-12(4)=48
-12(-3)=+36
-12(6)=-72
Hope this helps and for multiplying negative numbers just remember that if there’s an odd number of negative numbers then the answer will be negative but if there’s an even amount then the answer will be positive. Hope this helps