The following warnings occurred:
Warning [2] count(): Parameter must be an array or an object that implements Countable - Line: 795 - File: showthread.php PHP 7.4.33 (FreeBSD)
File Line Function
/showthread.php 795 errorHandler->error




HP Forums / Not HP Calculators / Not remotely HP Calculators v / sqrt question

Post Reply 
sqrt question
04-06-2017, 03:25 PM
Post: #1
KeithB Offline
Senior Member
 		Posts: 556
Joined: Jan 2017
sqrt question
I just saw one of those "Do you think you know the answer" things.

"What is the result of sqrt(-4)*sqrt(-9)"

If you look at it one way there is no answer.
If you combine the operations: sqrt(-4)*sqrt(-9) = sqrt(-4*-9) = sqrt(36) = 6

otherwise:
sqrt(-4) = 2i, sqrt(-9) = 3i, 2i*3i = -6, since i*i = -1.

Which do you think is the answer they wanted?
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
sqrt question - KeithB - 04-06-2017 03:25 PM
RE: sqrt question - pier4r - 04-06-2017, 04:01 PM
RE: sqrt question - Namir - 04-06-2017, 04:02 PM
RE: sqrt question - KeithB - 04-06-2017, 04:51 PM
RE: sqrt question - Han - 04-06-2017, 05:46 PM
RE: sqrt question - pier4r - 04-06-2017, 05:15 PM
RE: sqrt question - KeithB - 04-06-2017, 06:03 PM
RE: sqrt question - Han - 04-06-2017, 06:18 PM
RE: sqrt question - Claudio L. - 04-07-2017, 01:23 PM
RE: sqrt question - Han - 04-07-2017, 04:48 PM
RE: sqrt question - Claudio L. - 04-07-2017, 09:15 PM
RE: sqrt question - Han - 04-07-2017, 10:54 PM
RE: sqrt question - Claudio L. - 04-09-2017, 03:59 AM
RE: sqrt question - David Hayden - 04-24-2017, 09:36 PM
RE: sqrt question - Claudio L. - 04-26-2017, 03:08 AM
RE: sqrt question - Han - 04-28-2017, 06:09 PM
RE: sqrt question - nsg - 04-07-2017, 11:34 PM
RE: sqrt question - Vtile - 04-09-2017, 10:41 AM
RE: sqrt question - nsg - 04-09-2017, 05:26 PM
RE: sqrt question - Vtile - 04-09-2017, 11:07 PM
RE: sqrt question - nsg - 04-10-2017, 01:44 AM
RE: sqrt question - Vtile - 04-25-2017, 11:38 PM



User(s) browsing this thread: 5 Guest(s)

Contact Us | The Museum of HP Calculators | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication