Mathematics
22 Online
OpenStudy (anonymous):
Help me on this problem
(Intemediate level)
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OpenStudy (anonymous):
\[\huge \log10(x-1)^{3} - 3\log10(x-3)= \log 10(8)\]
OpenStudy (anonymous):
\[Find \huge logx(625)\]
OpenStudy (math_genius123):
Solution
log10 (8) - 1/3 Log10 (x) = log10 (2)
or, log10(8) - log 10 (x^1/3) = log10 (2)
or, log10 (8/x^1/3) = log 10 ( 2)
Equating both side we get
( 8/ x^ 1/3 ) = 2
or 4 = x^ 1/3
solving the above equation we get
x = 4 ^ 3
==> x = 64
OpenStudy (anonymous):
I am getting 4 as the answer
OpenStudy (anonymous):
@iambatman
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OpenStudy (anonymous):
@Zale101
OpenStudy (anonymous):
@satellite73
OpenStudy (anonymous):
i can't read this sucker
OpenStudy (anonymous):
\[ \log(x-1)^{3} - 3\log(x-3)= \log (8)\] like that?
OpenStudy (anonymous):
yes
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OpenStudy (anonymous):
sucker ?
OpenStudy (anonymous):
ok lets write it as a single log
OpenStudy (anonymous):
I am getting 4
OpenStudy (anonymous):
\[\log\left(\frac{(x-1)^3}{(x-3)^3}\right)=\log(8)\]
OpenStudy (anonymous):
this looks ugly so lets make it look like
\[3\log(\frac{x-1}{x-3})=\log(8)\]
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OpenStudy (anonymous):
nope, i like it better the other way
OpenStudy (anonymous):
I am getting 4 as the answer
OpenStudy (anonymous):
get
\[(\frac{x-1}{x-3})^3=8\] and so
\[\frac{x-1}{x-3}=2\]
OpenStudy (anonymous):
seems unlikely, let me check it
OpenStudy (anonymous):
\[x-1=2(x-3)\\
x-1=2x-6\\x=5\]
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OpenStudy (anonymous):
logx(625)
x=4
OpenStudy (anonymous):
oooh ok i didn't see the last part
OpenStudy (anonymous):
\[\log_5(625)=4\] got it
OpenStudy (anonymous):
Thank you for help!!
OpenStudy (anonymous):
yw
you did all the work