Author Topic: can any1 solve this maths question.  (Read 1911 times)

Offline immortal

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Re: can any1 solve this maths question.
« Reply #15 on: May 04, 2010, 01:07:06 pm »
@immortal - u answered ur own doubt, lol.
I actually got da ans today,& sme told da ans 0.107 waz wrong, dats y...
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Offline Igcseboy

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Re: can any1 solve this maths question.
« Reply #16 on: May 04, 2010, 06:19:06 pm »
I got da ans.
3x+2=3x+32
3x*32=3x+32
9*3x=3x+9
9*3x-3x=9
3x(9-1)=9
3x*8=9
3x=9/8
x=ln(9/8)/ln3
x=0.107(3 s.f)

It cud also b done using iteration.


how did u get (9-1)????

Offline dlehddud

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Re: can any1 solve this maths question.
« Reply #17 on: May 05, 2010, 08:24:11 am »
It's cos he factorised 3^x out of the equation to get 3^x(9-1)
I swear exams are going to be the end of me someday