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#1 2012-12-03 07:22:44

Member
Registered: 2012-12-03
Posts: 16

Solve X with e

Solve for x:

ln(x+3)=6

Can you explain to me how the answer is e^(6) -3

Thank you

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#2 2012-12-03 07:27:24

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

Re: Solve X with e

Have you tried doing this:
ln(x+3)=6, so
e[sup]ln(x+3)[/sup]=e[sup]6[/sup]

I just raised the number e to both sides, so that we can get rid of the logarithm in the next step.

Can you do it from here?

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#3 2012-12-03 07:28:17

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Registered: 2012-12-03
Posts: 16

Re: Solve X with e

I did it on a calculator first then tried on my own and became very confused.

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#4 2012-12-03 07:36:39

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

Re: Solve X with e

Hi

Do you understand the step in my post above?

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#5 2012-12-03 07:40:15

Member
Registered: 2012-12-03
Posts: 16

Re: Solve X with e

Im sorry, the e concept has me very confused. I feel like Ive wasted a lot of time on these type of examples on my own.

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#6 2012-12-03 08:23:25

Member
Registered: 2012-12-03
Posts: 16

Re: Solve X with e

Well let me see again...

That then takes me to the next step of

x+3=e^6

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#7 2012-12-03 08:38:22

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

Re: Solve X with e

Correct! Now you just subtract 3 from both sides and you're done!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#8 2012-12-03 09:38:36

Member
Registered: 2012-12-03
Posts: 16

x = e^6 -3

THANKS

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#9 2012-12-03 21:48:20

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

Re: Solve X with e

You're welcome.

Welcome to the forum!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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