(3+4i)+(-5+7i)
treat the i terms just like they were a variable
(3+4i)+(-5+7i)
= 3 + 4i - 5 + 7i
= 11i - 2
remember we can only add/subtract like terms.
(3+4i)+(-5+7i)
= 3 + 4i - 5 + 7i
= 11i - 2
remember we can only add/subtract like terms.