How do you combine like terms of $(9+ 3i ) - ( - 4- i )$ ?

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Answer 1 · 2016-12-24T20:19:29

$13+4i$

$(9+3i)-(-4-i)$

Distribute the negative
$(9+3i)+(4+i)$

Add constants
$13+3i+i$

Combine $i$ s
$13+4i$

How do you combine like terms of (9+ 3i ) - ( - 4- i )(9+ 3i ) - ( - 4- i )?