Answer:
554,555
Step-by-step explanation:

Get x to one side
So minus 90 from each side

-90÷-3=30
Answer: x=30
Answer:
x 1 1/3
Step-by-step explanation:
4/3 is equal to 1 1/3
(-2+8i)x(3-10i)
-2 x 3 - 2 x (-10i) +8i x 3- 8i x 10i
-6+20i+24i - 80i ^2
-6+20i+24i - 80 x (-1)
-6+20i+24i + 80
Answer: 74+44i
Unsure of what you want.
If you are merely to mult. the 3x3 matrix by -8, then mult. every one of the 9 elements in the first matrix by -8. That's it.
If there was more to this problem, please share the instructions.