Answer
$0+0i$
Work Step by Step
$(2-5i)-(3+4i)-(-1-9i)=2-5i-3-4i+1+9i=(2-3+1)+(-5-4+9)i=0+(0)i=0+0i$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.