76022sfox
26.03.2021 •
Mathematics
The line plot shows the time taken by John to solve ten different puzzles. What is the total time John took to solve all the ten puzzles
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Ответ:
this expression represent a real number when the imaginer part =0
(6+3i)(x+yi) = 6x+6yi+3ix+3yi² i²=-1
(6+3i)(x+yi) = 6x+6yi+3ix-3y
(6+3i)(x+yi) = 6x-3y +(6y+3x)istandard form
the imaginer part is : 6y+3x=0
for x=6 and y= - 3 : 6(-3)+3(6) =0