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Mathematics 7 Online
OpenStudy (anonymous):

solveeeeee

sam (.sam.):

\[\log_2{(\frac{x-5}{2x-3})^2}<0\]

sam (.sam.):

I'd recommend using rule \[\huge \log_ab=c \leftarrow \rightarrow b=a^c\]

OpenStudy (anonymous):

but what is c here

sam (.sam.):

0

sam (.sam.):

\[\huge \log_ab=c \leftarrow \rightarrow b=a^c \\ \\ \huge (\frac{x-5}{2x-3})^2<2^0\]

OpenStudy (anonymous):

yes.. i got the same

OpenStudy (anonymous):

now, rhs will become 1

sam (.sam.):

No you don't need it'll be just 1

OpenStudy (anonymous):

okay

sam (.sam.):

The sign should be x<-2

sam (.sam.):

Why not expand it?

OpenStudy (anonymous):

okay

OpenStudy (anonymous):

expand how

sam (.sam.):

\[\huge (\frac{x-5}{2x-3})^2<2^0 \\ \\ \huge \frac{(x-5)^2}{(2x-3)^2}<1 \\ \\ \huge x^2-10x+25<4x^2-12x+9\]

OpenStudy (anonymous):

okay

OpenStudy (shubhamsrg):

you'll have to consider this actually : -1 < (x-5)/(2x-3) < 1

OpenStudy (shubhamsrg):

one inequality at a time, 2 in total and take intersection of both results

sam (.sam.):

Its ok we'll have restrictions later

OpenStudy (shubhamsrg):

hmm

OpenStudy (anonymous):

so what should i do i mean should i follow @shubhamsrg or @.Sam. method

OpenStudy (shubhamsrg):

both are the same thing, @.Sam. is getting to it, he might guide you step to step :)

OpenStudy (anonymous):

thank u

OpenStudy (anonymous):

@.sam i got 3x^2-2x-16<0

sam (.sam.):

Factor it

sam (.sam.):

Yes then you got x=-2 and x=8/3 Using |dw:1368187144112:dw| We have x<-2 and x>8/3

OpenStudy (anonymous):

okay

OpenStudy (anonymous):

thank u @.Sam.

sam (.sam.):

But from \[\log_2{(\frac{x-5}{2x-3})^2}<0\] x values can only be less than zero, so the only answer is x<-2

OpenStudy (anonymous):

okay

sam (.sam.):

\[\log_2{(\frac{x-5}{2x-3})^2}\color{red}{<0}\]

OpenStudy (anonymous):

i got it

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