Complex Number

  • Thread starter JaysFan31
  • Start date
  • #1
JaysFan31
Calculate the real part, the imaginary part, and the absolute value of the following expression:

i * [(1+2i)(5-3i)+3i/(1+i)].


So I did the math out this way:

(1+2i)(5-3i)= 11+7i
(11+7i)+3i/(1+i)= (4+21i)/(1+i)
i * [(4+21i)/(1+i)] = (4i-21)/(1+i)

Is this correct and what do you call the imaginary part and the real part if a denominator exists with an imaginary i?

Thanks for any help.
 

Answers and Replies

  • #2
JaysFan31
Yeah I figured it out. You just multiply it by its conjugate earlier in the process.
 

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