Answer:
The answer is [9, 5, -4, 12]
Step-by-step explanation:
1) distribute the 3 within all the numbers on the right side. 3*2, 3*0, 3*-1, 3*4.
2) your right side should now have the numbers, 6, 0, -3, 12.
3) now add the numbers on the left with the numbers on the right, each should correspond with their place within the box. 3+6, 5+0 -1+-3 0+12
Hope this helps :)
