4 radical 6
you would make a favor tree for 12.
12 ---> 2, 2, 2, 3, -1
If you see a numbers twice you take it out and multiply it by the number in front of the radical.
-4i radical -6
the square root of a negative number is I.
-4i*i radical 6
i times itself is -1 so you'll multiply the negative 4 times the negative one and get positive four.
4 radical 6
