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

Author Topic: maths again!!!  (Read 3633 times)

nid404

  • Guest
Re: maths again!!!
« Reply #15 on: September 21, 2009, 04:40:11 pm »
okk...my bad.....i took it differently....i thought the wire is not cylindrical but rectangular....

got it...it's a 24cm wire, made into a rectangle


then ok...sorry my bad
Logged

Offline master786

  • SF Citizen
  • ***
  • Posts: 265
  • Reputation: 3269
  • Gender: Male
Re: maths again!!!
« Reply #16 on: September 21, 2009, 04:41:43 pm »
yes :D
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: maths again!!!
« Reply #17 on: September 21, 2009, 04:47:31 pm »
i'm not pretty sure of the second part..

but..i strongly think that it shud be --> 300<p<400

because it says its BETWEEN the range...

Logged
divine intervention!

nid404

  • Guest
Re: maths again!!!
« Reply #18 on: September 21, 2009, 04:49:38 pm »
Quote from: eddie_adi619 on September 21, 2009, 04:47:31 pm
i'm not pretty sure of the second part..

but..i strongly think that it shud be --> 300<p<400

because it says its BETWEEN the range...



that's what I know after doing inequalities from the text....u don't include the upper and lower bound when it says between
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: maths again!!!
« Reply #19 on: September 21, 2009, 07:25:54 pm »
Thanks for all that. Looks as though this question is answered
Logged

Offline spiderman

  • SPIDERMAN
  • SF Immigrant
  • **
  • Posts: 64
  • Reputation: 792
Re: maths again!!!
« Reply #20 on: September 22, 2009, 04:15:18 am »
Hey thanks guys!!!!!
Logged
Always hangin around ur neighbourhood..........

Offline spiderman

  • SPIDERMAN
  • SF Immigrant
  • **
  • Posts: 64
  • Reputation: 792
Re: maths again!!!
« Reply #21 on: September 22, 2009, 12:18:09 pm »
please can anyone help me with this sum

(x-3)^2 -3=0
Solve this quadratic function leaving surds in your answer.....
Logged
Always hangin around ur neighbourhood..........

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: maths again!!!
« Reply #22 on: September 22, 2009, 12:32:42 pm »
< = square root sign
------------------------------
first step - expand...

x2 - 6x + 9 -3 = 0

x2 -6x + 6 = 0

use the formula x = -b (+)<b2 - 4ac
                           -----------------------------      
                                            2a

and..                   x = -b (-)<b2 - 4ac
                           -----------------------------
                                            2a

simplify...

6 +<(36-24)
------------ = 6 +<12
        2          -------
                         2

=> 3 + (<12/2)

and 3 - (<12/2)

------------------

<12 represents the answer in surd form...
------
<12/2 can be written as (<3*4)/2 = (<3 * <4)/2 = (<3 *2)/2 = <3

-----

so the final answer is 3(+/-) <3

« Last Edit: September 22, 2009, 12:48:23 pm by eddie_adi619 »
Logged
divine intervention!

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: maths again!!!
« Reply #23 on: September 22, 2009, 12:35:18 pm »
find a ppt attached...it has the surd form thingy...
Logged
divine intervention!

Offline spiderman

  • SPIDERMAN
  • SF Immigrant
  • **
  • Posts: 64
  • Reputation: 792
Re: maths again!!!
« Reply #24 on: September 22, 2009, 12:44:06 pm »
but the answer in the text is 3+-square root of 3....
Logged
Always hangin around ur neighbourhood..........

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: maths again!!!
« Reply #25 on: September 22, 2009, 12:46:24 pm »
Quote from: spiderman on September 22, 2009, 12:44:06 pm
but the answer in the text is 3+-square root of 3....
its the same dude....<12/2 is further simplified as +-<3
Logged
divine intervention!

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: maths again!!!
« Reply #26 on: September 22, 2009, 12:47:23 pm »
Quote from: spiderman on September 22, 2009, 12:18:09 pm
please can anyone help me with this sum

(x-3)^2 -3=0
Solve this quadratic function leaving surds in your answer.....

Make x the subject

1. Add 3 to both sides

(x-3)^2 =3

2. Square root

(x-3)=\pm sqrt(3)

3. Add 3 to both sides.

==3\pm sqrt(3)
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: maths again!!!
« Reply #27 on: September 22, 2009, 12:49:06 pm »
Quote from: eddie_adi619 on September 22, 2009, 12:46:24 pm
its the same dude....<12/2 is further simplified as +-<3

modified the answer....check again,...

simplified <12/2 to <3

:)
Logged
divine intervention!

Offline spiderman

  • SPIDERMAN
  • SF Immigrant
  • **
  • Posts: 64
  • Reputation: 792
Re: maths again!!!
« Reply #28 on: September 22, 2009, 12:49:54 pm »
Thanks astar and eddie.......
Logged
Always hangin around ur neighbourhood..........

Offline spiderman

  • SPIDERMAN
  • SF Immigrant
  • **
  • Posts: 64
  • Reputation: 792
Re: maths again!!!
« Reply #29 on: September 22, 2009, 01:09:34 pm »
hey guys does anyone know where will i get the checkpoint math past papers for the years 2006-2009
Logged
Always hangin around ur neighbourhood..........
Pages: 1 [2] 3   Go Up
« previous next »