Answer
$12+4i$
Work Step by Step
$(4-i)+(8+5i)=4+8+(-1+5)i=12+(4)i=12+4i$
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.