How do you add #(2i + 9) + ( 8- 3i )#?

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Answer 1 · 2018-01-13T16:44:02

#17-i#

#(2i+9)+(8-3i)#

expand brackets:

#2i+9+8-3i#

collect like terms:

#9+8+2i-3i#

add:

#17-i#

[this corresponds to #a+bi# form, where #b=-1#]