Log4 x - log4 (x-3) = 5

  • Thread starter nae99
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  • #26
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Just check to see if x>3
and how do i go about doing that... i really dont understand that part
 
  • #27
Mentallic
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You just found that x=3072/1023, is this more than 3?
 
  • #28
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You just found that x=3072/1023, is this more than 3?
no its = 3
 
  • #29
Mentallic
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Not quite, 3*1023=3069
 
  • #31
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Not quite, 3*1023=3069
starting over, this is how i work it

log4 x/x-3 = 5

x/x-3 = 4^5

x = 1024 (x-3)

x = 1024x - 3072

x - 1024x = -3072

1023x = -3072

1023x/1023 = -3072/1023

x = -3.003
 
Last edited:
  • #32
HallsofIvy
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Yes, that is correct- only one step left.

You have 1023x= 3072 and you want x= something. How do you get rid of the "1023" that is multiplying the x?
 
  • #33
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Yes, that is correct- only one step left.

You have 1023x= 3072 and you want x= something. How do you get rid of the "1023" that is multiplying the x?
divide it by 1023
 
  • #35
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