Logarithms - Get the second solution to a

peggyleuwpodg

peggyleuwpodg

Answered question

2022-03-21

Logarithms - Get the second solution to a logarithm equation
Here's the original equation:
ln(11x10)+(ln(11x10))2=6
I've managed to obtain one solution: x=e2+1011
through those steps:
1. ln((11x10)(11x10)2)=6
2. ln((11x10)3)=6
3. (11x10)3=e6
4. 11x10=e2
5. 11x=e2+10
6. x=e2+1011
The textbook shows a second solution: x=10e3+111e3, but how do you get to that result?

Answer & Explanation

Demetrius Kaufman

Demetrius Kaufman

Beginner2022-03-22Added 10 answers

Your solution is incorrect because :
ln(11x10)+(ln(11x10))2 is not equal to
ln(11x10×(11x10)2)
To solve
ln(11x10)+(ln(11x10))2=6
Let t=ln(11x10)
t2+t6=0
this gives , t=2 and t=3
when t=2ln(11x10)=2x=e2+1011
when t=3ln(11x10)=3x=10e3+111e3
Ronald Martinez

Ronald Martinez

Beginner2022-03-23Added 7 answers

Hint: Let a=ln(11x10). Then you would have
a+a2=6ora2+a6=0.

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