What do you mean by conjugate of a complex number?

by changing the sign of imaginery part -

Explanation:

You find the complex conjugate simply by changing the sign of the imaginary part of the complex number. To find the complex conjugate of 4+7i we change the sign of the imaginary part. Thus the complex conjugate of 4+7i is 4 - 7i

In mathematics, the complex conjugate of a complex number is the number with an equal real part and an imaginary part equal in magnitude but opposite in sign.

explanation:

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maybe i could if you provided more information, such as a image of the text? (;