/sci/ - Science & Math

[Anonymous No.3616232]

ln e^x=-4

I've been having trouble figuring this one out, can someone help me?

picture not related.....

[Anonymous No.3616241]

>ln e^x=-4
>ln e^x
>x

[Anonymous No.3616248]

<div class="math">\ddot {O}[\eqn]</div>

[Anonymous No.3616249]

>>3616232

4/10

[Anonymous No.3616251]

>>3616241
i understand so much better now, thanks

[Anonymous No.3616261]

i dont know if you guys think im trolling, but this is a legitimate question my teacher gave me.

[Anonymous No.3616262]

>>3616251
I'm assuming you're a troll until you explain wtf the problem is.

[Anonymous No.3616265]

ln e^x = x * ln e = -4
x = -4 / ln e

Can't believe I still remember this from high school. Logarithmic identities, motherfucker.

[Anonymous No.3616267]

x=-4

[Anonymous No.3616268]

>>3616265
But you didn't remember <span class="math">\ln e = 1[/spoiler]...

[Anonymous No.3616271]

>>3616261
Do you simply not understand wtf a logarithm is?

[Anonymous No.3616276]

here is a picture of the problem

[Anonymous No.3616278]

>>3616268
I was so excited about remembering the identity that I forgot to solve the problem.

[Anonymous No.3616300]

jesus fucking asshair

ln takes a number and gives you the power of e that equals that number. ln e^x is therefore equal to the power e must be raised to to get e^x... so it's x

[Anonymous No.3616326]

<span class="math">\ln e^{x}=-4 \implies e^{\ln e^x} = e^{-4} \implies \ln e^{x} = \ln e^{-4} \implies x = -4[/spoiler]

[Anonymous No.3616339]

<span class="math">\ln e^{x}=-4 \;\;\;\;\;\gg\gg\gg\;\;\;\; e^{\ln e^x} = e^{-4} \;\;\;\;\gg\gg\gg\;\;\;\; \ln e^{x} = \ln e^{-4} \;\;\;\;\gg\gg\gg\;\;\;\; x = -4[/spoiler]

[Anonymous No.3616358]

http://www.reddit.com/r/AskReddit/