Do the operation and express the answer in a + bi form. Do not use parentheses in your answer: (8 - 3i ) -( -1- 15i )

(8 - 3i ) -( -1- 15i )

= 8 - 3i + 1 + 15i
= 9 + 12i

nothing new here, just like adding and subtracting x's and y's or some other
variables