Tangents - Tilted Forum Project Discussion Community

The_Dude · 09-17-2003, 05:51 PM

I cant seem to figure this one out.

The fact that h is approaching zero keeps throwing me off.

djtestudo · 09-17-2003, 06:43 PM

This is why I don't take college-level math.

The_Dude · 09-17-2003, 06:45 PM

kinda sux when u have to

EDIT : I Figured it out!

seems that 4 is the slope, and all u gotta do is to put it into slope intercept form.

i was thinking too hard!

and the answer is -15 if anyone is wondering

Sapper · 09-18-2003, 05:37 AM

What you are doing is using the long-form differentiation method to evaluate the derivative of f(x) when x=4.

Long story short: the derivative of a function gives you the slope at point (x,y) [plug x into the derivative f ' (x)] and plug x into f(x) to get "y".

the point-slop form y=mx+b is useful, however, also consider: y-y1 = m(x-x1) + b in the future.

sieger35 · 09-18-2003, 08:20 PM

hrmm.. unless I misunderstood your post Sapper, there is a very miniscule flaw. Just wanted to point out that y=mx+b is considered slope-intercept form, and that the other equation you stated was point-slope form. I know it's nothing big, but just thought I'd clarify that incase anyone got confused. :-)

Sapper · 09-19-2003, 11:30 AM

So true ... it's been awhile since I've had to consider the names of functions. In fact, for the first time in ages, I actually had to remember the intermediate value function in relation to infinity. So fundamental that I "just knew" the application .. but could not remember the proper name.

JusticeForPhat · 09-19-2003, 07:42 PM

As a double check, you might want to consider getting a Ti-89 graphing calculator. Will differentiate, integrate, and take limits symbolically. Wont help you learn the stuff, but its great to be able to check your answer before you have to hand something in or on a test.

Sapper · 09-21-2003, 12:47 PM

Is the TI-89 the one you can download Tetris onto ??

lol ...

Mephisto2 · 09-21-2003, 02:06 PM

You guys are making my brain bleed...

Mr Mephisto

09-17-2003, 05:51 PM	#1 (permalink)
The_Dude The GrandDaddy of them all! Location: Austin, TX	Tangents I cant seem to figure this one out. The fact that h is approaching zero keeps throwing me off. __________________ "Luck is what happens when preparation meets opportunity." - Darrel K Royal

09-17-2003, 06:43 PM	#2 (permalink)
djtestudo Baltimoron Location: Beeeeeautiful Bel Air, MD	This is why I don't take college-level math. __________________ "Final thought: I just rented Michael Moore's Bowling for Columbine. Frankly, it was the worst sports movie I've ever seen." --Peter Schmuck, The (Baltimore) Sun

09-17-2003, 06:45 PM	#3 (permalink)
The_Dude The GrandDaddy of them all! Location: Austin, TX	kinda sux when u have to EDIT : I Figured it out! seems that 4 is the slope, and all u gotta do is to put it into slope intercept form. i was thinking too hard! and the answer is -15 if anyone is wondering __________________ "Luck is what happens when preparation meets opportunity." - Darrel K Royal Last edited by The_Dude; 09-17-2003 at 06:50 PM..

09-18-2003, 05:37 AM	#4 (permalink)
Sapper Insane Location: The Internet	What you are doing is using the long-form differentiation method to evaluate the derivative of f(x) when x=4. Long story short: the derivative of a function gives you the slope at point (x,y) [plug x into the derivative f ' (x)] and plug x into f(x) to get "y". the point-slop form y=mx+b is useful, however, also consider: y-y1 = m(x-x1) + b in the future. __________________ rm -f /bin/laden

09-19-2003, 11:30 AM	#6 (permalink)
Sapper Insane Location: The Internet	So true ... it's been awhile since I've had to consider the names of functions. In fact, for the first time in ages, I actually had to remember the intermediate value function in relation to infinity. So fundamental that I "just knew" the application .. but could not remember the proper name. __________________ rm -f /bin/laden

09-18-2003, 08:20 PM	#5 (permalink)
sieger35 Upright	hrmm.. unless I misunderstood your post Sapper, there is a very miniscule flaw. Just wanted to point out that y=mx+b is considered slope-intercept form, and that the other equation you stated was point-slope form. I know it's nothing big, but just thought I'd clarify that incase anyone got confused. :-)

09-19-2003, 07:42 PM	#7 (permalink)
JusticeForPhat Crazy Location: Philly	As a double check, you might want to consider getting a Ti-89 graphing calculator. Will differentiate, integrate, and take limits symbolically. Wont help you learn the stuff, but its great to be able to check your answer before you have to hand something in or on a test.

09-21-2003, 12:47 PM	#8 (permalink)
Sapper Insane Location: The Internet	Is the TI-89 the one you can download Tetris onto ?? lol ... __________________ rm -f /bin/laden

09-21-2003, 02:06 PM	#9 (permalink)
Mephisto2 Junkie	You guys are making my brain bleed... Mr Mephisto