SOLUTION: State the complex conjugate and modulus of the complex number 2+9i

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Question 1156532: State the complex conjugate and modulus of the complex number 2+9i
Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

the complex conjugate and modulus of the complex number 2%2B9i is 2-9i

Answer by ikleyn(52790) About Me  (Show Source):
You can put this solution on YOUR website!
.

The answer by @MathLover1 is INCORRECT.

The correct answer is 

    The complex conjugate to the complex number 2+9i is 2-9i.

    The modulus of the complex number  2+9i  is  sqrt%282%5E2+%2B+9%5E2%29 = sqrt%284%2B81%29 = sqrt%2885%29.

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On complex numbers, see introductory lessons
    - Complex numbers and arithmetical operations on them
    - Complex plane
    - Addition and subtraction of complex numbers in complex plane
    - Multiplication and division of complex numbers in complex plane

    - Solved problems on taking roots of complex numbers
    - Solved problems on arithmetic operations on complex numbers
    - Solved problem on taking square root of complex number
in this site.

Also, you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Complex numbers".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.