How do you simplify $(12 - 6i) - (-3 - 8i)$ ?

Sep 19, 2016

$15+2i$

distribute the brackets and collect like terms.

$(12-6i)-(-3-8i)=12-6i+3+8i$

$=(12+3)+(-6i+8i)=15+2i$

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How do you simplify (12 - 6i) - (-3 - 8i)(12 - 6i) - (-3 - 8i)?