Hi There

[csuguy]

HI! Nice to have ya here PI!

Now find the derivative of f=(25x)^(1/2)-15 at x=3

 

[Stripe]

HI! Nice to have ya here PI!

Now find the derivative of f=(25x)^(1/2)-15 at x=3

EASY!

 

[csuguy]

EASY!

ya, but I didn't want to sit and think of something hard

 

[Prolifeguyswife]

Pi was a terrible movie...but welcome anyway!

 

[Sweet Pea]

TOL seems like an interesting place. My user name is hard to pronounce so just call me "Pie".

Welcome.

Is that the max number of characters allowed or how many decimal places you have memorized?

~SP

 

[Stripe]

ya

:rotfl:

Really??

 

[Stripe]

Whoa. I cracked 10,000.... :shocked:

 

[csuguy]

:rotfl:

Really??

Yep, just taking the limit as h->0. Basic Calculus.

 

[csuguy]

Whoa. I cracked 10,000.... :shocked:

ugh, how am I supposed to get to where I'm the top poster?! I suppose I could copy Daniel :chuckle:

 

[3.14159265358979]

HI! Nice to have ya here PI!

Now find the derivative of f=(25x)^(1/2)-15 at x=3

f (x) = (25x)^(1/2)-15
f (x) = 5(x)^1/2 -15
f '(x) = (5/2)(x)^(-1/2)
f '(3) = (5/2)(3)^(-1/2)
f '(3) = 1.443

 

[3.14159265358979]

Welcome.

Is that the max number of characters allowed or how many decimal places you have memorized?

~SP

Yes.

 

[dan1el]

HOORAY, MATHEMATICS! <3

 

[csuguy]

f (x) = (25x)^(1/2)-15
f (x) = 5(x)^1/2 -15
f '(x) = (5/2)(x)^(-1/2)
f '(3) = (5/2)(3)^(-1/2)
f '(3) = 1.443

OR

lim h->0 ((5(x+h)^(1/2)-15)-5(x)^(1/2)+15)/h
lim h->0 (5(x+h)^(1/2)-5(x)^(1/2))/h * (5(x+h)^(1/2)+5(x)^(1/2))/(5(x+h)^(1/2)+5(x)^(1/2))
lim h->0 (25x+25h-25x)/(h(5(x+h)^(1/2)+5(x)^(1/2))
lim h->0 (25)/(5(x+h)^(1/2)+5(x)^(1/2))

= 25/(10(x)^1/2)
= 25/(~17.321)
= 1.443

But your ways easier

 

[3.14159265358979]

Sorry, I haven't been around. I wasn't hyding. I had to go see my doctor. Dr. J.E. Kyll. TOL seems like the Internet version of the Old Wild West. Why are there many abortion, gay, and creation/evolution threads? :idunno:

 

[3.14159265358979]

OR

lim h->0 ((5(x+h)^(1/2)-15)-5(x)^(1/2)+15)/h
lim h->0 (5(x+h)^(1/2)-5(x)^(1/2))/h * (5(x+h)^(1/2)+5(x)^(1/2))/(5(x+h)^(1/2)+5(x)^(1/2))
lim h->0 (25x+25h-25x)/(h(5(x+h)^(1/2)+5(x)^(1/2))
lim h->0 (25)/(5(x+h)^(1/2)+5(x)^(1/2))

= 25/(10(x)^1/2)
= 25/(~17.321)
= 1.443

But your ways easier

I see you used the formal definition of a derivative. Impressive! :bow:

 

[Quincy]

Greetings Pie! Did you know that the WWJD fish is actually the most accurate visual representation of Pi? Most people think its just a fish but it's reallyp art of two circles. Anyways, welcome! useless bit of trivia hehe.

 

[Delmar]

TOL seems like an interesting place. My user name is hard to pronounce so just call me "Pie".

I like "cheese cake" better!

 

[Quincy]

Sorry, I haven't been around. I wasn't hyding. I had to go see my doctor. Dr. J.E. Kyll. TOL seems like the Internet version of the Old Wild West. Why are there many abortion, gay, and creation/evolution threads? :idunno:

Because the people here are split on those issues, many pro choice people as well as fundamental people. Though abortion is something agreed upon for the most part.

 

[Stripe]

Sorry, I haven't been around. I wasn't hyding. I had to go see my doctor. Dr. J.E. Kyll. TOL seems like the Internet version of the Old Wild West. Why are there many abortion, gay, and creation/evolution threads? :idunno:

Some people are stupid and don't know right from wrong.

 

[Town Heretic]

Like I've always said, nothing draws folks into a forum like a math thread. No siree...

That aside, who doesn't like pi? I'm sure you'll be a happy addition around here and don't mind me, I've been surly since my Fun With Sentence Diagramming thread was met with a grave like silence.

Welcome. :e4e: