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Mathematics 13 Online
OpenStudy (anonymous):

help!

OpenStudy (anonymous):

jimthompson5910 (jim_thompson5910):

Hint: you can rewrite (x-1)^(-1) as 1/((x-1)^1) or just 1/(x-1)

jimthompson5910 (jim_thompson5910):

From there, multiply every term by the inner LCD x-1 to clear out the inner fractions

OpenStudy (anonymous):

multiply top and bottom by (x-1)

OpenStudy (anonymous):

you got this?

OpenStudy (anonymous):

\[\frac{3(x-1)^{-1}+7}{7(x-1)^{-1}+3}\] is your problem i think it is really a compound fraction because \((x-1)^{-1}=\frac{1}{(x-1)}\)

OpenStudy (anonymous):

so if you do as @juantweaver suggested, multiplying top and bottom by \((x-1)\) will clear the fractions in one step

OpenStudy (anonymous):

\[\frac{3(x-1)^{-1}+7}{7(x-1)^{-1}+3}\times \frac{(x-1)}{(x-1)}\] \[\frac{3+7(x-1)}{7+3(x-1)}\] then multiply out and combine like terms

OpenStudy (anonymous):

\[2+7x-7\div7+3x-3\]?

OpenStudy (anonymous):

i think that 2 is a typo

OpenStudy (anonymous):

\[\frac{3+7(x-1)}{7+3(x-1)}=\frac{3+7x-7}{7+3x-3}=\frac{7x-4}{3x+4}\]

OpenStudy (anonymous):

yes i meant 3

OpenStudy (anonymous):

is that it?

OpenStudy (anonymous):

yup

OpenStudy (anonymous):

ok im going to do a similar one

OpenStudy (anonymous):

OpenStudy (anonymous):

that's what i got

OpenStudy (anonymous):

give me a second to check

OpenStudy (anonymous):

close, but you are off in the denominator the numerator is \(3x+1\) but the denominator should be \(4x+1\) not \(3x+1\)

jimthompson5910 (jim_thompson5910):

I think you mean 4x-1 instead of 4x+1

OpenStudy (anonymous):

yeah that is what i meant sorry

OpenStudy (anonymous):

ok thank you :)

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