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Mathematics 9 Online
OpenStudy (wintersuntime):

can someone help me with the problem Im about to post below.

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

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

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

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

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 ?

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

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

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)

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

OpenStudy (anonymous):

what is x

OpenStudy (anonymous):

3/-29

OpenStudy (wintersuntime):

oh ok now i see why

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

:)

OpenStudy (wintersuntime):

thank you so much :)

OpenStudy (anonymous):

you are welcome

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