Mathematics
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OpenStudy (anonymous):
help!
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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?
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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
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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
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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
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OpenStudy (anonymous):
yeah that is what i meant
sorry
OpenStudy (anonymous):
ok thank you :)