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Find the complex conjugate of(3 5i)/(1 2i) - ABA English Facebook Apps

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When you divide (3 5i)/(1 2i) you get (2.6, -.2i) so the complex conjugate would be (2.6, 0.2i). In polar form that is 2.608 at 4.399 degrees. [Calculation done using TI-86] Best Wishes!

Posted on Mar 31, 2011


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F(x) is cubic function with zeros at +3 and +2+2i, find equation for f(x)=-12 need help please

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To get the conjugate of a complex number simply flip the sign of the imaginary part. The conjugate of 3+5i is 3-5i.

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See the screen captures.



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Differentiate (sin x)x w.r.t. x.

Question 1: (i) Find the complex conjugate of (3+5i)/(1+2i)

(ii) Differentiate (sin x)x w.r.t. x.

(iii) Find all the seventh roots of (3+4i).

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How do you use the i function. My teacher couldnt find it and we are doing imaginary numbers so i realllly need to know

Turn calculator ON.
If you see no icons, press [MENU] key.
Use Arrows to focus on RUN and press [EXE]
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Press [F3] to activate it.
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"Is there anything that I can do about this to stop my answers being complex numbers when solving cubic equations?"
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Let your equation be
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It suffices to look at the Tartaglia/Cardano expressions of the roots to know that more often than not there is going to be complex roots.


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