Author Topic: MATH HELP...!! URGENT...  (Read 6219 times)

Offline nits94

  • SF Citizen
  • ***
  • Posts: 154
  • Reputation: 172
  • Gender: Female
Re: MATH HELP...!! URGENT...
« Reply #15 on: October 27, 2009, 11:30:06 am »
see ...its like 2 to the power 5 is 32 right? so 32^n=2^5...so n=5...thats it...got it???
Choosy mothers choose studies... ;)

Offline Deep

  • Newbie
  • *
  • Posts: 5
  • Reputation: 15
Re: MATH HELP...!! URGENT...
« Reply #16 on: October 27, 2009, 11:32:29 am »
For the 1st 1..
U don't really ahve to use log.. I just realised that..
It's pretty simple in fact
32 = 2^5

 n Root of 32 = 32^(1/n)
Implying that 2^(5/n) = 8
Now, 8 = 2^3

=>    32^(1/n) = 2^(5/n) = 8 = 2^3

2^(5/n) = 8 = 2^3

=>>   Equating the powers of 2
        5/n = 3
        n = 5/3
This method is useful if you are not allowed the use of a calculator

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: MATH HELP...!! URGENT...
« Reply #17 on: October 27, 2009, 11:32:43 am »
From wer do u get 5??   Can we use log for this question???

how will u express 4 as 2x

ofcourse it is 22 which is equal to 4

samething for 32

2what? = 32

2^5 = 32

yes u can use log this way

----
2x = 32

log232 = x

in ur calculator do this

(log 32)/ (log 2) to get the answer 5

follow the rest of the steps for solving

@nits94 - n is not equal to 5...u have to express 32 as 2^5 adn then do it
divine intervention!

Offline sameer210394

  • SF Citizen
  • ***
  • Posts: 190
  • Reputation: 219
  • Gender: Male
Re: MATH HELP...!! URGENT...
« Reply #18 on: October 27, 2009, 11:33:16 am »
From wer do u get 5??   Can we use log for this question???

this question does not expect log, though you can use...

32n = 2

in this case u have to rearrange 32n in such that its base is 2.

so 32 can be written as 25.

so now    
              25n  =   2

     now as the base are same, the power has to be the same, therefore 5n = 1

now solve for n and the answer is 0.2  or 1/5
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 Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: MATH HELP...!! URGENT...
« Reply #19 on: October 27, 2009, 11:33:42 am »
this is d quest...

the above was the answer for the quoted one..
divine intervention!

Offline Deep

  • Newbie
  • *
  • Posts: 5
  • Reputation: 15
Re: MATH HELP...!! URGENT...
« Reply #20 on: October 27, 2009, 11:34:23 am »
For the 1st 1..
U don't really ahve to use log.. I just realised that..
It's pretty simple in fact
32 = 2^5

 n Root of 32 = 32^(1/n)
Implying that 2^(5/n) = 8
Now, 8 = 2^3

=>    32^(1/n) = 2^(5/n) = 8 = 2^3

2^(5/n) = 8 = 2^3

=>>   Equating the powers of 2
        5/n = 3
        n = 5/3
This method is useful if you are not allowed the use of a calculator

Offline **!!superexcited!!!**

  • SF Citizen
  • ***
  • Posts: 190
  • Reputation: 239
  • Gender: Female
Re: MATH HELP...!! URGENT...
« Reply #21 on: October 27, 2009, 11:35:29 am »
 :)Thanx
see ...its like 2 to the power 5 is 32 right? so 32^n=2^5...so n=5...thats it...got it???

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: MATH HELP...!! URGENT...
« Reply #22 on: October 27, 2009, 11:36:13 am »
:)Thanx

thats a rong method..

n is not equal to 5

look at the method i sameer, deep and i gave above..
divine intervention!

Offline nits94

  • SF Citizen
  • ***
  • Posts: 154
  • Reputation: 172
  • Gender: Female
Re: MATH HELP...!! URGENT...
« Reply #23 on: October 27, 2009, 11:37:20 am »
m confused...i usually get it as n=5...n my teacher says its right...is it in any of the past papers???
Choosy mothers choose studies... ;)

Offline **!!superexcited!!!**

  • SF Citizen
  • ***
  • Posts: 190
  • Reputation: 239
  • Gender: Female
Re: MATH HELP...!! URGENT...
« Reply #24 on: October 27, 2009, 11:37:36 am »
 :) Thank u guys...Ur solutions really helped me...
Thanx again :)

Offline **!!superexcited!!!**

  • SF Citizen
  • ***
  • Posts: 190
  • Reputation: 239
  • Gender: Female
Re: MATH HELP...!! URGENT...
« Reply #25 on: October 27, 2009, 11:38:31 am »
yeah.. anywayz gtg study now... Talk to you later bye :)
m confused...i usually get it as n=5...n my teacher says its right...is it in any of the past papers???

Offline nits94

  • SF Citizen
  • ***
  • Posts: 154
  • Reputation: 172
  • Gender: Female
Re: MATH HELP...!! URGENT...
« Reply #26 on: October 27, 2009, 11:56:43 am »
o ya ..u all r right...its llike
32^n=2
so 2^5n=2^1
that is 5n=1
n=1/5
Choosy mothers choose studies... ;)

Offline **!!superexcited!!!**

  • SF Citizen
  • ***
  • Posts: 190
  • Reputation: 239
  • Gender: Female
Re: MATH HELP...!! URGENT...
« Reply #27 on: October 27, 2009, 02:34:13 pm »
Hey guys sry to disturb ull but 1 more :) ....plz help

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: MATH HELP...!! URGENT...
« Reply #28 on: October 27, 2009, 02:36:02 pm »
square both sides..

32 = 2^2p

5 = 2p

p = 2.5
divine intervention!

Offline @d!_†oX!©

  • SF Master
  • ******
  • Posts: 1268
  • Reputation: 2105
  • Gender: Male
Re: MATH HELP...!! URGENT...
« Reply #29 on: October 27, 2009, 02:37:41 pm »
hey adi...shudn't it be like this???
root 32 = sp
=>21/5 = 2p
=>p = 1/5
AAL IZZ WELL!!! ;)