Complex Numbers : Modulus and Argument | ExamSolutions

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Make sure your calculator is in radians mode. I suspect it is in degrees mode.

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How do I take the calculator to radians mode in casio fx-991

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@@imranalif4792 Shift > Menu > 2:Angle input > 2: Radian

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That's good.

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[@SyntaxError-nz4kg]

Thank you so much! I was unsure how the awnser of a problem where I have to find argument of a problem simply indicated as being -3i (so the real axis (Re) is 0), but you explained it perfectly in how the angle is measured from different segments. Because the point is in the 3pi over 2 line, the angle is pi over 2 (I know it's shown as a minus, but my teacher always siad an angle can never be negative so that's what had me confused and I THINK I understand it now, thanks to you). I would never have even known how to ask about this, but you awnsered it so perfectly, thank you sooo much!

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Chloe Millar

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Great vid! Another care should be taken when talking about Arg(z) and arg(z).

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Thanks

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Thank you so much!!! This was explained really poorly in my lectures

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[@ExamSolutions_Maths]

The word is quadrant. The first quadrant is the section in the top right of the cross going from 0 to 90 degrees. The 2nd quadrant is the top right going from 90 to 180 degrees. The 3rd quadrant goes from 180 to 270 degrees and the 4th quadrant from 270 to 360 degrees.

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Cheers

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Brilliant explanation 🙏

[@blahbleh5671]

It's much easier to just consider this rule: argz=tan^-1(y/x) (+/ - pi for fourth and third quadrant respectively) i.e. Add pi if z on the argand diagram falls in the top left quadrant. Subtract pi if z on the argand diagram falls in the bottom left quadrant.

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Excellent explanation

[@serpentgamer7396]

question? do you require to keep your calculator in radians mode all the time for complex numbers?

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I just understand that if the real number is negative then you are going to have 'negative(π negative the answer in rads)' Thank you so much sir jah Bless

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[@jyotishmahenry4082]

Bruh...u explained this within 16 mins and 49 seconds and made me understand while my teacher explained it over an hour and i still couldn't understand.

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if u can calc. theta in degrees ur job is done. angle in rad = (ang in deg) * pi / 180

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What about finding complex when given, modulus and arg

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And you

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[@ethanlim23]

I have a question. Let's say z=1+i Argument of z would then be equals to 45 degrees. How about the argument of 2z? Do you take 2 times 45 degrees? Or is the argument of 2z still equals to 45 degrees?

[@ExamSolutions_Maths]

Still 45 degrees. The mod is doubled though.

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wow is it a coincidence the video length is 16 minutes 49 seconds which is also 4 ^ 2 minutes 7 ^ 2 seconds

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