« previous next »
Pages: [1] 2 3 ... 7   Go Down

Author Topic: IGCSE Maths doubt(paper 4)  (Read 14374 times)

Offline @d!_†oX!©

  • SF Master
  • ******
  • Posts: 1268
  • Reputation: 2105
  • Gender: Male
IGCSE Maths doubt(paper 4)
« on: October 30, 2009, 07:31:53 am »
ok guys, here i come with yet another unusual question.... ;D ;D
seriously i haven't seen this anywhere else :o :o
(x:15-2x?7)?(x:5x-2>10-x)


i though maybe ":" sign implies ratio which is actually division
so by taking division(ex, x/(15-2x) i tried to solve it...but this is where i could reach ann dunno how to go about it now :-[ :-[
(x?7)?(5x²-47x+20>0)

PLEASE HELP GUYS!!!!!!
Logged
AAL IZZ WELL!!! ;)

Offline @d!_†oX!©

  • SF Master
  • ******
  • Posts: 1268
  • Reputation: 2105
  • Gender: Male
Re: IGCSE Maths doubt(paper 4)
« Reply #1 on: October 30, 2009, 07:35:23 am »
hey i dunno y but some characters are not coming
lke the intersection character and the greater than or equal to character
anyways i'll tell u now:
(x:15-2x>=7)intersection(x:5x-2>10-x)
Logged
AAL IZZ WELL!!! ;)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: IGCSE Maths doubt(paper 4)
« Reply #2 on: October 30, 2009, 07:38:52 am »
which past paper is this?

and yea..

(x:15-2x>=7)intersection(x:5x-2>10-x)

is the above the only q?
Logged
divine intervention!

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: IGCSE Maths doubt(paper 4)
« Reply #3 on: October 30, 2009, 07:42:51 am »
ok..heres it..

that ":" means "such that"...its dere in the book..read it.


k..so..
solve the inequalitites in both the sides to get

(15-2x>=7) n (5x-2>10-x)

solve them

(x<= 4) n (x>2)

now the left hand side values can be... 4,3,2,1,0 and so on

right hand side.. 3, 4, 5 and so on

the intersection is (3,4)
Logged
divine intervention!

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
Re: IGCSE Maths doubt(paper 4)
« Reply #4 on: October 30, 2009, 07:43:47 am »
dude it means x is a set such that 15-x>7
and another set is such that x 5x-2>10-x

hope you get it!!
Logged
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline @d!_†oX!©

  • SF Master
  • ******
  • Posts: 1268
  • Reputation: 2105
  • Gender: Male
Re: IGCSE Maths doubt(paper 4)
« Reply #5 on: October 30, 2009, 07:43:58 am »
yaa!!!!
dts the only question!!!
no link to any other part,....
By the way its from june 1988..
yeah i know its too old...but dude...dts a pretty confusing question!!
Logged
AAL IZZ WELL!!! ;)

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
Re: IGCSE Maths doubt(paper 4)
« Reply #6 on: October 30, 2009, 07:45:33 am »
done!!
ig uess aadi has solved it!!

not toxic!!

lolzz :D :D
Logged
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: IGCSE Maths doubt(paper 4)
« Reply #7 on: October 30, 2009, 07:45:44 am »
lol..wats the confusing thing

solve the inequalitites ..thats it..

and find the intersection..

is the answer (3,4)
Logged
divine intervention!

Offline @d!_†oX!©

  • SF Master
  • ******
  • Posts: 1268
  • Reputation: 2105
  • Gender: Male
Re: IGCSE Maths doubt(paper 4)
« Reply #8 on: October 30, 2009, 07:45:53 am »
ohhhh!!!!
oh yeah i get it now
but i didnt take it as "such as"
because the whole thing was written inside the brackets....so thought maybe its part of the inequality
dude...they gotta make this thing clear in the question!!!
Logged
AAL IZZ WELL!!! ;)

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
Re: IGCSE Maths doubt(paper 4)
« Reply #9 on: October 30, 2009, 07:46:41 am »
thaht is what they call IG rite??
Logged
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline sameer210394

  • SF Citizen
  • ***
  • Posts: 190
  • Reputation: 219
  • Gender: Male
Re: IGCSE Maths doubt(paper 4)
« Reply #10 on: October 30, 2009, 06:41:00 pm »
Quote from: @d!_†oX!© on October 30, 2009, 07:31:53 am
ok guys, here i come with yet another unusual question.... ;D ;D
seriously i haven't seen this anywhere else :o :o
(x:15-2x?7)?(x:5x-2>10-x)


i though maybe ":" sign implies ratio which is actually division
so by taking division(ex, x/(15-2x) i tried to solve it...but this is where i could reach ann dunno how to go about it now :-[ :-[
(x?7)?(5x²-47x+20>0)

PLEASE HELP GUYS!!!!!!



solve both the inequalities separately...

                     15 - 2x >= 7                              5x-2 > 10 - x
                     15 >= 7 +2x                               6x -2 >10
                     8 >= 2x                                     6x >12
                     4 >= x                                       x > 2

now put these inequalities together

                  4  >=  x   >  2

this is the answer.
Logged
Son, if you really want something in this life, you have to work for it. Now quiet! They're about to announce the lottery numbers

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
Re: IGCSE Maths doubt(paper 4)
« Reply #11 on: October 30, 2009, 06:41:51 pm »
done dude!!!

it was alread solved!!
how was ur dad's b'day party??
Logged
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: IGCSE Maths doubt(paper 4)
« Reply #12 on: October 31, 2009, 05:44:07 am »
Quote from: sameer210394 on October 30, 2009, 06:41:00 pm

solve both the inequalities separately...

                     15 - 2x >= 7                              5x-2 > 10 - x
                     15 >= 7 +2x                               6x -2 >10
                     8 >= 2x                                     6x >12
                     4 >= x                                       x > 2

now put these inequalities together

                  4  >=  x   >  2

this is the answer.


the intersection is asked..

so it wud be.. 3,4

By the way..whose b'day party?!?!?
Logged
divine intervention!

Offline sameer210394

  • SF Citizen
  • ***
  • Posts: 190
  • Reputation: 219
  • Gender: Male
Re: IGCSE Maths doubt(paper 4)
« Reply #13 on: October 31, 2009, 06:39:30 am »
Quote from: A@di on October 31, 2009, 05:44:07 am
the intersection is asked..

so it wud be.. 3,4

By the way..whose b'day party?!?!?

ryt, the intersection can be anything between  4 >= x > 2
it can be 3.2 also,  it is not mention whether the numbers is a whole numbers ???

i don't i think the answer should be written in this way...


abbey DAd ka B'Day tha...
Logged
Son, if you really want something in this life, you have to work for it. Now quiet! They're about to announce the lottery numbers

Alpha

  • Guest
Re: IGCSE Maths doubt(paper 4)
« Reply #14 on: October 31, 2009, 07:04:00 am »
Quote
4 >= x > 2


Simplified, isn't it x > 2 ???
Logged
Pages: [1] 2 3 ... 7   Go Up
« previous next »