Which is equal to (–6 + 5i) – (9 – 5i)?

Question

Which is equal to (–6 + 5i) – (9 – 5i)?

Answer 1

(-6+5i) - (9-5i)= -6 +5i - 9 +5i = -15 +10i

Answer 2

Keep the numbers and the i's separate.  And, make sure to be careful with the signs.

 

-6 -9 = -15

5i - (-5i)= 10i

 

so, the answer is: -15 + 10i