simple question - approximating a square root - Math Help Forum

$Math Help Forum$

$Go Back$		Math Help Forum > University Math Help > Calculus
$Reload this Page$ simple question - approximating a square root

Download MHF Flyer

Mark Forums Read

$Reply$

#1

$Old$ November 18th, 2009, 03:51 PM

ayarfal40 $ayarfal40 is offline$

Newbie

Join Date: Nov 2009

Posts: 1

Country:

United States

Thanks: 0

Thanked 0 Times in 0 Posts

$ayarfal40 is on a distinguished road$

$Default$ simple question - approximating a square root

how do you approximate the differential of a square root? for example the square root of 23, something thats not as obvious.

$Reply With Quote$

Advertisement

#2

$Old$ November 18th, 2009, 04:11 PM

$mr fantastic's Avatar$

mr fantastic $mr fantastic is online now$

Flow Master

Join Date: Dec 2007

Location: Zeitgeist

Posts: 13,550

Country:

Australia

Thanks: 2,998

Thanked 5,265 Times in 4,614 Posts

$mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$ $mr fantastic has a reputation beyond repute$

$Default$

Quote:

Originally Posted by ayarfal40 $View Post$

how do you approximate the differential of a square root? for example the square root of 23, something thats not as obvious.

$f(x + h) \approx f(x) + h f'(x)$ .

For the example you give, $f(x) = \sqrt{x}$ , $x = 25$ and $h = -2$ .

__________________
There are two things you should never try to prove: the impossible and the obvious.

The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark. (Michelangelo Buonarroti)

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

$Reply With Quote$

$Reply$

« implicit differentiation | Top | Evaluating the line integral.... »

Thread Tools
$Show Printable Version$ Show Printable Version $Email this Page$ Email this Page
Display Modes
$Linear Mode$ Linear Mode $Hybrid Mode$ Switch to Hybrid Mode $Threaded Mode$ Switch to Threaded Mode

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Trackbacks are Off Pingbacks are Off Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 03:50 AM.

your link here Sponsors

rv solar, e-learning,

Math Help Forum is a community of maths forums with an emphasis on maths help in all levels of mathematics.
Register to post your math questions or just hang out and try some of our math games or visit the arcade.