Qualification > Math

C1 Edexcel Jan2010 Question! Please help!

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astarmathsandphysics:
(a) Given that t = log3 x, find expressions in terms of t for
(i) log3 x2,
(ii) log9 x.
(b) Hence, or otherwise, find to 3 significant figures the value of x such that
log3
x2 ? log9 x = 4.

ai)2t
ii)log9 x =lig3 x^(1/2) =1/2 t
retype qb

halosh92:

--- Quote from: T.Q on April 26, 2010, 01:51:44 pm ---for part aii

change the base

and make it 3

so it will be like this   (log3 x) /(log3 9)

so log3 x = t

and log3 9 = 2

why cant we use the inverse rule here....like make it 1/log x3 ...............where log x3=1/t ??????
which rule did u use there exactly....... how did u derive the base as 3 in (log3 x) /(log3 9)

so the answer is (1/2 t)

--- End quote ---

T.Q:

--- Quote from: halosh92 on April 26, 2010, 02:07:42 pm ---

--- End quote ---


i used this rule  

so log9 x = log x /log 9  , then u put any  base u want , i chose 3

halosh92:

--- Quote from: T.Q on April 26, 2010, 02:24:35 pm ---
i used this rule  

so log9 x = log x /log 9  , then u put any  base u want , i chose 3

--- End quote ---

thankyou :)

halosh92:
people
could anyone do q7c
plzzz urgentttt

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