Yes it is. All pure imaginary numbers (such as 5i) as well as all real numbers and any combination of real & imaginary (by adding, subtractin, multiplying, dividing) makes a complex number.
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Complex ; 9 - 5i It conjugate is ' 9 + 5i'.
The conjugate is 7-5i
9-5i
That 5 is a factor.
To get the complex conjugate, change the sign in front of the imaginary part. Thus, the complex conjugate of -4 + 5i is -4 - 5i.