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How is the product of a complex number and a real number represented on the complex plane?

Consider the product of −2+8i and 5.

 Feb 10, 2021
 #1
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Modulus  of    -2  +  8i  =sqrt  [ (-2)^2  + 8^2  ]  = sqrt [ 4 + 64 ] =  sqrt [ 68]   = sqrt [ 4 * 17 ] =  2sqrt (17)

 

5 (-2 + 8i)  =  -10  +  40i

 

a positive real number

 

 

cool cool cool

 Feb 10, 2021

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