Mathematics
9 Online
OpenStudy (wintersuntime):
can someone help me with the problem Im about to post below.
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OpenStudy (imsleeziboii):
mhmm
OpenStudy (wintersuntime):
\[81^{4x-3} =27^{3(5x-1)}\]
OpenStudy (anonymous):
gimme one sec
OpenStudy (wintersuntime):
ok
OpenStudy (anonymous):
x=-3/29
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OpenStudy (wintersuntime):
how?
OpenStudy (anonymous):
no idea I just put it into an online calculator, tbh
OpenStudy (imsleeziboii):
winter
OpenStudy (anonymous):
Since the bases are the same, set the exponents equal to each other.
OpenStudy (wintersuntime):
ok
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OpenStudy (anonymous):
Hey do you still need some help with that
OpenStudy (wintersuntime):
yes please
OpenStudy (anonymous):
okay
OpenStudy (anonymous):
so tell me what can divide 27
OpenStudy (wintersuntime):
9 and 3
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OpenStudy (anonymous):
okay good and i know you know that 3 and 9 can divide 81 right
OpenStudy (wintersuntime):
yup
OpenStudy (anonymous):
okay then since we both know this can we perform a crazy magic
OpenStudy (wintersuntime):
yes
OpenStudy (anonymous):
how many times can 3 divide 81
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OpenStudy (wintersuntime):
27
OpenStudy (anonymous):
what is the \[\sqrt[4]{81}\]
OpenStudy (wintersuntime):
3
OpenStudy (anonymous):
how about
\[\sqrt[3]{27}\]
OpenStudy (wintersuntime):
wouldn't it be 3 as well ?
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OpenStudy (wintersuntime):
because 3*3*3= 27
OpenStudy (anonymous):
oh yes now you have just change your question to a simple on here is how it looks like now\[3^{4(4x-3)}=3^{3(3(5x-1))}\]
OpenStudy (wintersuntime):
so since they're the same bases I would just set the equations
OpenStudy (anonymous):
yes then you cancel out the 3 and work on the equation
OpenStudy (wintersuntime):
would I start by distributing after I have cancelled out the 3
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OpenStudy (anonymous):
i mean this\[4(4x-3)=3(3(5x-1))\]
OpenStudy (anonymous):
now can you find x
OpenStudy (wintersuntime):
yes but how do I start ? Do I distribute
OpenStudy (anonymous):
okay work on this first 3(5x-1)
OpenStudy (wintersuntime):
that would equal 15x-3
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OpenStudy (anonymous):
okay now finish it up
4(4x-3)=3(15x-3)
OpenStudy (wintersuntime):
I don't know what to do
OpenStudy (anonymous):
okay 4(4x-3) solve that out first
OpenStudy (wintersuntime):
16x-12?
OpenStudy (anonymous):
okay do the same thing to 3(15x-3)
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OpenStudy (wintersuntime):
so it would be 16x-12=45x-9?
OpenStudy (anonymous):
oh that is good can you finish it up now
OpenStudy (anonymous):
what is x
OpenStudy (wintersuntime):
-29/3
OpenStudy (anonymous):
okay hold on
16x-45x=12-9
-29x=3
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OpenStudy (anonymous):
what is x
OpenStudy (anonymous):
3/-29
OpenStudy (wintersuntime):
oh ok now i see why
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
:)
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OpenStudy (wintersuntime):
thank you so much :)
OpenStudy (anonymous):
you are welcome