Mathematics
6 Online
OpenStudy (anonymous):
Solve the equation attached for x :)
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OpenStudy (anonymous):
OpenStudy (anonymous):
A. x = 8/5
B. x = -8/5
C. x = 0, 8/5
D. There are no solutions.
jimthompson5910 (jim_thompson5910):
test each answer choice
so plug in x = 8/5, what do you get?
OpenStudy (anonymous):
how do i plug it in?? in format via calc?
jimthompson5910 (jim_thompson5910):
replace x with 8/5
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jimthompson5910 (jim_thompson5910):
and use a calculator
OpenStudy (anonymous):
okay so for x=8/5 i got .76339... is that right?
jimthompson5910 (jim_thompson5910):
on the left side?
OpenStudy (anonymous):
noo i did this.. log(3)8/5... idk i feel like thats wrong tho :(
OpenStudy (anonymous):
thats wrong isn't it??!! :O
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jimthompson5910 (jim_thompson5910):
yeah it looks odd
OpenStudy (anonymous):
okay so how should i put it in my calc?
jimthompson5910 (jim_thompson5910):
log(5*8/5) + log( 8/5 - 1) for the left side
OpenStudy (anonymous):
=6812412374
is that right?
jimthompson5910 (jim_thompson5910):
whoa...way too big
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jimthompson5910 (jim_thompson5910):
oh you meant 0.6812412373 right?
OpenStudy (anonymous):
yeah sorry my bad!!
OpenStudy (anonymous):
weird i thought i pressed the "." lol
jimthompson5910 (jim_thompson5910):
do the same for the right side
OpenStudy (anonymous):
8/5log3 ?
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jimthompson5910 (jim_thompson5910):
log( 3 * 8/5 ) = ???
OpenStudy (anonymous):
ohhh okay
=same as above :)
jimthompson5910 (jim_thompson5910):
so 8/5 is a solution
is -8/5 a solution??
OpenStudy (anonymous):
so my answer is automatically A. x=8/5
??
jimthompson5910 (jim_thompson5910):
no it might be 0 or -8/5
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jimthompson5910 (jim_thompson5910):
haven't ruled them out yet
OpenStudy (anonymous):
idk lemme check :)
left side
umm it won't even let me enter it.. it says error..
jimthompson5910 (jim_thompson5910):
that's because the domain of log(x) is x > 0
so x = 0 and x = -8/5 aren't even defined
OpenStudy (anonymous):
kk so my answer is just x=8/5 then??
A. x=8/5 is my answer right?
jimthompson5910 (jim_thompson5910):
exactly
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OpenStudy (anonymous):
awesome! :) Thanks!