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#1 Re: Help Me ! » Geometry Help! » 2015-04-18 05:00:28

hussam

Hi krash;

Q1. use the rule AC² =AB² +BC² -2AB.BC.Cos(B)

AC² =9+1-2(1)(3).Cos(40)

#2 Re: Help Me ! » The imaginary unit (i). » 2015-04-18 03:31:26

hussam

i have read  what he post smilesmile

Thanks for you and thanks for him .

#3 Re: Help Me ! » The imaginary unit (i). » 2015-04-18 03:13:53

hussam

hi Olinguito ; ok

what is that rule

Olinguito wrote:

So if you want to have

[list=*]
[*]

[/*]
[/list]

one of the √(−1) is supposed to be i and the other −i. Similarly if

[list=*]
[*]

[/*]
[/list]

one of the √(−1) is supposed to be i and the other two either both i or both −i. With a one–many relation you can't always tell.

#4 Re: Help Me ! » The imaginary unit (i). » 2015-04-17 23:09:28

hussam

hi Olinguito;

Olinguito wrote:
hussam wrote:

√(-9)=√(-1*9)=√(-1)*√(9)=3i

That's not quite right;

√4=2 ( not -2 )

but -√4=-2

so you cant write √4=-2/+2

just you can write this when you have for example:

X²=4     So X=√4=2 / X=-√4=-2

Hussam

#5 Re: Help Me ! » The imaginary unit (i). » 2015-04-17 09:33:47

hussam

Thank you anyway;)

#6 Re: Help Me ! » The imaginary unit (i). » 2015-04-17 09:19:16

hussam

/thank you /

#7 Re: Help Me ! » The imaginary unit (i). » 2015-04-17 08:21:18

hussam

i don't think that because

√(-9)=√(-1*9)=√(-1)*√(9)=3i

#8 Re: Help Me ! » The imaginary unit (i). » 2015-04-17 07:00:05

hussam

hi bobbym;

ok, this is the question i need : we know that  i=√( -1)       

so i^2=  √( -1)*√( -1) = √[( -1)( -1)]=√ ( 1)=1

thus; i=1 or i=-1 how can it be?

#9 Help Me ! » The imaginary unit (i). » 2015-04-17 06:05:53

hussam
Replies: 16

Hi;

i will give a simple question, then the question extends to another more complicated question   

My question is  whether the  -roots  multiply properties-  of the real numbers  is fine with the imagine numbers?

#10 Re: Help Me ! » Einstein puzzles : who lives in the city ? » 2015-04-15 16:00:24

hussam

Hi phrontister;

i tried it , its better than the last one which has lack with information

the solution is single ,

                    1                               2                             3                                4                                  5
Name               Bob                         Rachael                     Eilish                          Keeley                            Amy

TV:        The Simpsons               Neighbours         Desperate Housewives     Coronation Street                Eastenders

Destination     France                       Italy                         Africa                        England                          Australia

Age             46                            21                            81                                  52                                14

they live    Town                    Youth Hostel                  City                              Village                             Farm

Hairstyle      Bald                         Long                        Afro                              Curly                            Straight



Thank you!


HUSSAM

#11 Help Me ! » Einstein puzzles : who lives in the city ? » 2015-04-15 07:15:56

hussam
Replies: 3

hi;

you had provided this solution to this puzzle, Obviously it's true



                                                 
                                  1                        2                  3                            4                                  5           
Name                      Bob                Rachael          Eilish                        Keeley                        Amy

Favorite TV       The Simpsons        Coronation        Housewives            Neighbours                Eastenders
programme   
   
Destination             France                    Italy                  Africa                     England                    Australia

     Age                    46                      21                     81                        52                              14

Where they live           Town              Youth Hostel           Farm                     Village                     City

Hairstyle                   Bald                   Long                   Afro                      Curly                    Straight

(Solution by Zoe Reader, Bourne Grammar School, Bourne, Lincolnshire, in March 2006, and revised by Bob Bundy, phrontister and anonimnystefy of the Math is Fun Forum in June 2012)





I found out another solution please check if it is correct




                                                 
                                  1                        2                  3                            4                                  5           
Name                      Bob                Rachael          kelly                        Eilish                        Amy

Favorite TV       The Simpsons        Coronation        Housewives            Neighbours                Eastenders
programme   
   
Destination             Australia                    Italy                  Africa                     England                     france

     Age                    81                      21                     52                        46                               14

Where they live           farm              Youth Hostel          village                       city                              town

Hairstyle                   straight              Long                   Afro                      blad                            curley


Thanks

Hussam

#12 Re: Help Me ! » x! » 2015-04-12 23:47:27

hussam

Thank you  ishwar , the first post for you is to help me ! thank you .

#13 Re: Introductions » A grateful student » 2015-04-12 00:07:21

hussam

thank you ganesh

#14 Re: Introductions » A grateful student » 2015-04-11 01:07:03

hussam

thank you too Bob

#15 Introductions » A grateful student » 2015-04-11 01:02:11

hussam
Replies: 5

Hello;
I have been taking benefits from this site for year ago
But did not join the forum until this the moment.....
I want to thank the Administrator and Mediators and others for these benefits that they provide to many students like me.

Hussam

#16 Re: Help Me ! » x! » 2015-04-10 19:50:19

hussam

thank you  phrontister , bobbym

#17 Re: Exercises » kind of the triangle » 2015-04-10 19:01:07

hussam

(the final of the kind of the triangle exercises).   
9. A  triangle ABC
The angles achieve the following relationship :[Sin(A)]^2+[Sin(B)]^2+[Sin(C)]^2=2
what kind of this triangle?

#18 Help Me ! » x! » 2015-04-10 18:08:17

hussam
Replies: 9

hi everyone;

I know that 3!=3*2*1    4!=4*3*2*1 ........

but how can i calculate (0.5)! or (0.2)!  ?

my calculator show me that (0.5)!=1   and (0.2)!=1

is there a rule to calculate X! : (x isn't a natural number)?

#19 Re: Exercises » kind of the triangle » 2015-04-10 17:41:53

hussam

8.    A  triangle ABC
The angles achieve the following relationship :[Sin(A)]^2=Cos(C).Cos(A-B)
what kind of this triangle?

#20 Re: Exercises » kind of the triangle » 2015-04-10 16:43:56

hussam

7.  A  triangle ABC
The angles achieve the following relationship :[Sin(A)]^2=[Sin(B)]^2+[Sin(C)]^2
what kind of this triangle?

#21 Re: Exercises » kind of the triangle » 2015-04-10 15:36:48

hussam

6.  A  triangle ABC
The angles achieve the following relationship :Sin(A)+Cos(A)=Sin(B)+Cos(B)
what kind of this triangle?

#22 Re: Exercises » kind of the triangle » 2015-04-10 15:30:48

hussam

hi bob;

Q3 is correct !

Q5; there is another situation: C=90

#23 Re: Exercises » kind of the triangle » 2015-04-10 05:55:56

hussam

Q4 is correct!

#24 Re: Exercises » kind of the triangle » 2015-04-10 05:51:34

hussam

so, shall i  provide more ?

#25 Re: Exercises » kind of the triangle » 2015-04-10 05:33:54

hussam
bob bundy wrote:

Are you giving us these as challenges or because you cannot do them and want help?

Bob

hi bob;

when i need help so i write in the (help me page)

i dont challenge any one

i give these exercises because MR Mathisfun sayed

MathsIsFun wrote:

Welcome to the Exercises section of the forum smile

Please contribute some exercises to help people who are still learning what you already know

Hussam

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