How do you multiply #(-7-4i)(-6-6i)#?

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Jim G. Share
Feb 9, 2018

Answer:

#18+66i#

Explanation:

#"expand the factors using FOIL"#

#color(orange)"Reminder "i^2=(sqrt(-1))^2=-1#

#rArr(-7-4i)(-6-6i)#

#=42+42i+24i+24i^2#

#=42+66i-24#

#=18+66ilarrcolor(blue)"in standard form"#

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