Answer:
9 i - 7
Explanation:
Simplify the following:
-7 + 8 i - (-5 i + 4 i)
Hint: | Combine like terms in -5 i + 4 i.
-5 i + 4 i = -i:
-7 + 8 i - -i
Hint: | Multiply all instances of -1 in -(-i).
(-1)^2 = 1:
-7 + 8 i + i
Hint: | Add the numbers in -7 + 8 i + i together.
Add like terms. -7 + 8 i + i = -7 + 9 i:
Answer: 9 i - 7