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For \(z = -3 + 5i\), evaluate \( z \overline{z}.\)

 

Note: \(\overline{z}\) denotes the conjugate of \( z.\)

 

Thank you!!

 Jan 10, 2021
 #1
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To find the conjugate of a z    just change the sign of the imaginary part

(-3+5i)(-3-5i) =  9 + 15i -15i- 25i2

                             = 9 - 25(-1) = 9+25 = 34

 Jan 10, 2021

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