Simple log problem from analysis...i dont understand what i am doing wrong. Here is my work:
log(5x-1)-log(2x-3)=2
log(5x-1)/(2x-3)=2
(5x-1)/(2x-3)=2^10
10x^2-2x-15x+3=200x-300
10x^2-17x+303=0
realllllly messed up-_-
log(5x-1)-log(2x-3)=2
log(5x-1)/(2x-3)=2
(5x-1)/(2x-3)=2^10
10x^2-2x-15x+3=200x-300
10x^2-17x+303=0
realllllly messed up-_-
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First, in your third line
(5x-1)/(2x-3)=2^10
you seem to have mixed up the base (which is 10) with the logarithm (2). It should read
(5x-1)/(2x-3)=10^2
however, that could be just a typing error, since you have corrected it in the continuation.
Your crucial error is in the next line.
From
(5x-1)/(2x-3) = 200
when you multiply both sides by (2x - 3) you get
(5x - 1) (2x - 3)
------------------- = 200 (2x - 3)
. . . (2x - 3)
which simplifies to just
(5x - 1) = 200 (2x - 3)
Otherwise, everything is fine.
(5x-1)/(2x-3)=2^10
you seem to have mixed up the base (which is 10) with the logarithm (2). It should read
(5x-1)/(2x-3)=10^2
however, that could be just a typing error, since you have corrected it in the continuation.
Your crucial error is in the next line.
From
(5x-1)/(2x-3) = 200
when you multiply both sides by (2x - 3) you get
(5x - 1) (2x - 3)
------------------- = 200 (2x - 3)
. . . (2x - 3)
which simplifies to just
(5x - 1) = 200 (2x - 3)
Otherwise, everything is fine.
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OKAY. HERE IS MY SOLUTION.
LOG((5X-1)/(2X-3))=2
(5X-1)/(2X-3)=(10°2)=100
5X-1=100(2X-3)
5X-1=200X-300
195X=299
X=23/15
HOPE THIS HELPED.
(HINT: U DONT HAVE TO MULTIPLY 5X-1 AND 2X-3)
LOG((5X-1)/(2X-3))=2
(5X-1)/(2X-3)=(10°2)=100
5X-1=100(2X-3)
5X-1=200X-300
195X=299
X=23/15
HOPE THIS HELPED.
(HINT: U DONT HAVE TO MULTIPLY 5X-1 AND 2X-3)