Author Topic: can any1 solve this maths question.  (Read 1948 times)

Offline immortal

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can any1 solve this maths question.
« on: April 20, 2010, 02:40:12 pm »
3^(x+2)=3^x+3^2
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Offline Saladin

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Re: can any1 solve this maths question.
« Reply #1 on: April 20, 2010, 02:49:15 pm »
Working on it.

nid404

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Re: can any1 solve this maths question.
« Reply #2 on: April 20, 2010, 02:55:45 pm »
base is the same

so x+2= (x+3)2
x+2 = x2+6x+9
x2+5x+7=0

solve the quadratic equation
u get x= -2.5

Offline immortal

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Re: can any1 solve this maths question.
« Reply #3 on: April 20, 2010, 04:22:15 pm »
3x+2=3x+32

as per calculator, i get ans as 0.1072 (4s.f)
i wanna 2 kno how 2 derive at this ans.
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nid404

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Re: can any1 solve this maths question.
« Reply #4 on: April 20, 2010, 04:29:41 pm »
3x+2=3x+32

as per calculator, i get ans as 0.1072 (4s.f)
i wanna 2 kno how 2 derive at this ans.

I guess I haven't gotten ur question right then :-\

Is it
3x+2=3x+32
or is it
3x+2=3(x+3)2

Offline immortal

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Re: can any1 solve this maths question.
« Reply #5 on: April 20, 2010, 04:34:16 pm »
It's da 1st one  3x+3=3x+32
tnk nid 4 ur help.
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Offline Saladin

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Re: can any1 solve this maths question.
« Reply #6 on: April 20, 2010, 04:34:40 pm »
I guess I haven't gotten ur question right then :-\

Is it
3x+2=3x+32
or is it
3x+2=3(x+3)2


Thats is my question as well.

nid404

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Re: can any1 solve this maths question.
« Reply #7 on: April 20, 2010, 05:48:55 pm »
not possible i think :-\

Offline immortal

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Re: can any1 solve this maths question.
« Reply #8 on: April 20, 2010, 07:34:07 pm »
Cn any Ans this question,,PLZ :)
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Offline Saladin

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Re: can any1 solve this maths question.
« Reply #9 on: April 20, 2010, 07:42:50 pm »
The answer should be x=-0.965

nid404

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Re: can any1 solve this maths question.
« Reply #10 on: April 20, 2010, 07:43:52 pm »
The answer should be x=-0.965

how would you derive that??

Offline immortal

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Re: can any1 solve this maths question.
« Reply #11 on: April 21, 2010, 03:45:54 pm »
the ans is 0.1072 (4s.f) i think,cn any1 show da steps 2 derive at this :(
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nid404

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Re: can any1 solve this maths question.
« Reply #12 on: April 21, 2010, 04:49:44 pm »
the ans is 0.1072 (4s.f) i think,cn any1 show da steps 2 derive at this :(

nope that can't be...i crosschecked

Offline immortal

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Re: can any1 solve this maths question.
« Reply #13 on: May 04, 2010, 12:56:50 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.
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Offline Ghost Of Highbury

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Re: can any1 solve this maths question.
« Reply #14 on: May 04, 2010, 01:01:11 pm »
@immortal - u answered ur own doubt, lol.
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