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Complete IIT AIEEE ICSE ISC PMT help forum :: Maths :: Maths help forum

maths

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nausheen
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maths Vide
PostSubject: maths maths EmptySat Feb 02, 2008 11:17 am
using the properties of propotion  solve the following for the value of x

x3+3x        =    341
----------        ------
3x2 +1              91
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abhas
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maths Vide
PostSubject: Solution ICSE Maths Ratio componendo - dividendo Question maths EmptySun Feb 03, 2008 8:15 pm
maths Ratio10


x3 + 3x = 341
3x2 + 1 91





using componendo - dividendo we get



=>

x3 + 3x+3x2 + 1 = 432 = 216
x3 + 3x -3x2 +1 250 125



=>

(x+1)3 = 63
(x -1)3 53



=>

(x+1) = 6
(x -1) 5



=>

5x +5=6x-6



=>

-x = -11

=>

x=11 ans.
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