You may move the terms in x to the left side and then you could use the property of quotient of logarithms having same bases.
log (2x)-log(x-6)=log 5
Use quotient property: log u-log v=log (u/v)
log (2x)-log(x-6)=log [(2x)/(x-6)]
log [(2x)/(x-6)]=log5
The bases of logarithms are the same and the logarithmic function is injective, therefore (2x)/(x-6)=5
Subtract 5 both sides=>
(2x)/(x-6)-5=0
(2x-5x+30)/(x-6)=0
Add terms from numerator:
-3x+30=0
-3x=-30=>x=10
The solution is approved because the only value that is not allowed for x is x=6 because the denominator of the fraction (2x-5x+30)/(x-6) must not be zero.
Answer: x=10
We have to solve: log(2x) = log 5 + log(x – 6)
log(2x) = log 5 + log(x – 6)
use the property log a + log b = log (a*b)
=> log(2x) = log (5*(x – 6))
Now we can equate 2x and 5(x - 6)
2x = 5(x - 6)
=> 2x = 5x - 30
=> 3x = 30
=> x = 30/3
=> x = 10
The solution of the equation is x = 10
See eNotes Ad-Free
Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.
Already a member? Log in here.