x Turn on thread page Beta
 You are Here: Home >< Maths

# Complex Numbers Calculator Issue watch

1. Hello

I was just playing around with the ol' Casio and even though it's in complex mode, I get "math error" when I try to work out powers of complex numbers in the rectangular form greater than 2.

For example

(2 + 3i)^2 will give me -5 + 12i normally

but anything larger i.e.

(2+3i)^10 returns an error. Anyone know why?
2. (Original post by Student403)
Hello

I was just playing around with the ol' Casio and even though it's in complex mode, I get "math error" when I try to work out powers of complex numbers in the rectangular form greater than 2.

For example

(2 + 3i)^2 will give me -5 + 12i normally

but anything larger i.e.

(2+3i)^10 returns an error. Anyone know why?
What model is it?
3. (Original post by Zacken)
What model is it?
It's a Casio fx-115ES PLUS

EDIT: Just tried on my graphing calculator and that's fine working out arbitrary powers. .Just seems to be this calculator
4. (Original post by Student403)
It's a Casio fx-115ES PLUS

EDIT: Just tried on my graphing calculator and that's fine working out arbitrary powers. .Just seems to be this calculator
Looking at the user guide here: http://support.casio.com/storage/en/..._PLUS_C_EN.pdf it seems like only x^1, x^2, x^(-1) works if x is a complex number, I might be wrong though.
5. (Original post by Zacken)
Looking at the user guide here: http://support.casio.com/storage/en/..._PLUS_C_EN.pdf it seems like only x^1, x^2, x^(-1) works if x is a complex number, I might be wrong though.
Hmm okay! Thanks for your help Luckily I think graphing ones are allowed in all exams so I should be fine anyway ^^

PRSOM
6. (Original post by Student403)
Hmm okay! Thanks for your help Luckily I think graphing ones are allowed in all exams so I should be fine anyway ^^

PRSOM
That's a bit weird though - yeah, all graphing calculators that are non-CAS are allowed in all exams. You'll defo be fine.
7. (Original post by Student403)
Hmm okay! Thanks for your help Luckily I think graphing ones are allowed in all exams so I should be fine anyway ^^

PRSOM
I think you can do it if rather than raising it to the power 3, you multiply it by itself 3 times - if you know what I mean.
8. (Original post by Zacken)
That's a bit weird though - yeah, all graphing calculators that are non-CAS are allowed in all exams. You'll defo be fine.
Sounds good! Do you own a graphing calc?
9. (Original post by Student403)
Sounds good! Do you own a graphing calc?
My brother has a TI N-Spire so I use that every now and then, I'm not really a fan of calculators though.
10. (Original post by B_9710)
I think you can do it if rather than raising it to the power 3, you multiply it by itself 3 times - if you know what I mean.
Oh good call yes And if you want to, you can do (a+bi)^2(a+bi)^2(a+bi)^2(a+bi) for 7, for example

(Original post by Zacken)
My brother has a TI N-Spire so I use that every now and then, I'm not really a fan of calculators though.
Oh wow! That sounds like a beast xD
11. (Original post by B_9710)
I think you can do it if rather than raising it to the power 3, you multiply it by itself 3 times - if you know what I mean.
Oooh matron
12. (Original post by Student403)
Hello

I was just playing around with the ol' Casio and even though it's in complex mode, I get "math error" when I try to work out powers of complex numbers in the rectangular form greater than 2.

For example

(2 + 3i)^2 will give me -5 + 12i normally

but anything larger i.e.

(2+3i)^10 returns an error. Anyone know why?
Oi what GDC do you own?
13. (Original post by aymanzayedmannan)
Oi what GDC do you own?
I have the Casio FX-9860 GII. How about you?
14. (Original post by Student403)
I have the Casio FX-9860 GII. How about you?
I've been meaning to ask you this for a while. I wanted to get that one but I've decided to order the TI-84 instead because a relative is coming back from the States How is it serving you? Does it noticeably help with exams?
15. (Original post by aymanzayedmannan)
I've been meaning to ask you this for a while. I wanted to get that one but I've decided to order the TI-84 instead because a relative is coming back from the States How is it serving you? Does it noticeably help with exams?
Ooh okay my teachers (who are real experts with this kinda stuff) say the Casio has a nicer user interface but the TI is much more powerful. So I guess once you learn it, yours will be much more useful in university!

As for how helpful, I found it invaluable during the SATII MathII exam. But I can also say it saved me last year during the C3 exam. Literally using it, I picked up a graphing mark using it at the last second, which got me to 71/75 which happened to be the boundary for full UMS

So yes, I do have a love for mine I wouldn't say it was noticeable though. But perhaps this year with harder pure modules like FP2/FP3 it will be more useful
16. (Original post by Student403)
Ooh okay my teachers (who are real experts with this kinda stuff) say the Casio has a nicer user interface but the TI is much more powerful. So I guess once you learn it, yours will be much more useful in university!

As for how helpful, I found it invaluable during the SATII MathII exam. But I can also say it saved me last year during the C3 exam. Literally using it, I picked up a graphing mark using it at the last second, which got me to 71/75 which happened to be the boundary for full UMS

So yes, I do have a love for mine I wouldn't say it was noticeable though. But perhaps this year with harder pure modules like FP2/FP3 it will be more useful
i have an Albert

17. (Original post by Student403)
Ooh okay my teachers (who are real experts with this kinda stuff) say the Casio has a nicer user interface but the TI is much more powerful. So I guess once you learn it, yours will be much more useful in university!

As for how helpful, I found it invaluable during the SATII MathII exam. But I can also say it saved me last year during the C3 exam. Literally using it, I picked up a graphing mark using it at the last second, which got me to 71/75 which happened to be the boundary for full UMS

So yes, I do have a love for mine I wouldn't say it was noticeable though. But perhaps this year with harder pure modules like FP2/FP3 it will be more useful
Apparently the CASIO doesn't have a natural display??? That kinda put me off, but I did watch some nice video tutorials. Tbh I'm gonna need a while getting adjusted because I've never used anything other than a 991ES

Very nice! It pretty much saved your ass C3 then. Last year's C3 was tricky as well, so good show.

Precisely the two reasons I'm getting it. We can't all be Zacken's now, can we? He's been doing loci calculations in his backyard since he was born xD
18. (Original post by the bear)
i have an Albert

We have a Linda!

(Original post by aymanzayedmannan)
Apparently the CASIO doesn't have a natural display??? That kinda put me off, but I did watch some nice video tutorials. Tbh I'm gonna need a while getting adjusted because I've never used anything other than a 991ES

Very nice! It pretty much saved your ass C3 then. Last year's C3 was tricky as well, so good show.

Precisely the two reasons I'm getting it. We can't all be Zacken's now, can we? He's been doing loci calculations in his backyard since he was born xD
I'm not sure what a natural display is xD But yeah it shouldn't take too long to get used to!

It certainly did save my butt Thanks a lot!

Agreed :s He had a special childhood
19. Lool, I just work them out
20. (Original post by Student403)
We have a Linda!

I'm not sure what a natural display is xD But yeah it shouldn't take too long to get used to!

It certainly did save my butt Thanks a lot!

Agreed :s He had a special childhood
طالب اربع مئة وثلث. ما حدث لك صورة؟ أنت تبدو مختلفة اليوم.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: February 23, 2016
Today on TSR

### Housemate is dealing drugs

Strangers keep coming over to pick up, help!

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams