Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**gbrad88****Member**- Registered: 2012-12-03
- Posts: 16

Solve for x:

ln(x+3)=6

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

Thank you

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

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.

Offline

**gbrad88****Member**- Registered: 2012-12-03
- Posts: 16

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

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

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.

Offline

**gbrad88****Member**- Registered: 2012-12-03
- Posts: 16

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.

Offline

**gbrad88****Member**- Registered: 2012-12-03
- Posts: 16

Well let me see again...

That then takes me to the next step of

x+3=e^6

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

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.

Offline

**gbrad88****Member**- Registered: 2012-12-03
- Posts: 16

x = e^6 -3

THANKS

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,000

You're welcome.

Welcome to the forum!

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.

Offline

Pages: **1**