Question

If z = 7-9i, find zz bar​

Answer 1

Step-by-step explanation:

zz bar is conjugate so the sign will change and then it is multiplied

Answer 2

130

Given:

• Z= 7-9i

To Find:

• to find the value of zz bar​

Solution:

                                         _

The conjugate of   Z   =  (Z)    =   7+9i

  _

Z.Z     =     (7-9i)   .    (7+9i)    [ a²-b²  =   ( a + b ) ( a  -b ) ]

      [ i ²  =  - 1 ]

    = ( 7 ) ² -  ( 9 i ) ²

    = { 49 - ( -81 ) }

    = ( 49 + 81 )

   

     = 130

Therefore we remained ZZ bar  : 130 .

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