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Mathematics 6 Online
OpenStudy (anonymous):

Solve the equation attached for x :)

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

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

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

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 ?

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

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

OpenStudy (anonymous):

awesome! :) Thanks!

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