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Express (4-5i)(-5+5i)  in the form a+bi , where a and b are integers and i^2=-1.

 Mar 16, 2021
 #1
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FOIL:

 

(4 - 5i)(-5 + 5i)

= (4)(-5) + (4)(5i) + (-5i)(-5) + (-5i)(5i)

= -20 + 20i - 25i - 25

= -45 - 5i

 Mar 16, 2021
 #2
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Actually I figured it out it's 5 + 45i. Ty for trying tho!!

 

smileylaughcool

 Mar 16, 2021

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