My Math Forum  

Go Back   My Math Forum > High School Math Forum > Geometry

Geometry Geometry Math Forum


Reply
 
LinkBack Thread Tools Display Modes
March 4th, 2015, 03:17 PM   #1
Member
 
Joined: Jan 2015
From: Norway

Posts: 95
Thanks: 1

Question Scalar coordinate for a length of a vector

Task 2.31
|[-3,4]| The answer is 5 the book says.
But i get = |[-3,4]| = -3^2 + 4^2 = -9 + 16 = 7 sqrt = 2.65

To get 5 i need to have 9 + 16 = 25 sqrt = 5

My question is how does -9 turn too + 9. ?
Zman15 is offline  
 
March 4th, 2015, 03:33 PM   #2
Math Team
 
skeeter's Avatar
 
Joined: Jul 2011
From: Texas

Posts: 3,003
Thanks: 1588

$(-3)^2 = 9$
skeeter is offline  
March 5th, 2015, 09:18 AM   #3
Math Team
 
Joined: Jan 2015
From: Alabama

Posts: 3,264
Thanks: 902

First, you question is the distance from (0, 0) to this point, right?
(You need two points to find a length!)

Notice the difference between and .
Country Boy is offline  
Reply

  My Math Forum > High School Math Forum > Geometry

Tags
coordinate, cordinate, length, scalar, vector



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Scalar triple product and abstract vector space AspiringPhysicist Linear Algebra 0 February 4th, 2015 04:55 AM
Scalar and vector fields, calculating gradients arron1990 Calculus 7 August 9th, 2012 07:46 AM
vector product of a vector and a scalar? 71GA Algebra 1 June 3rd, 2012 01:20 PM
Special type of scalar vector projection. 1101 Algebra 0 March 7th, 2011 02:00 PM
Scalar Multiplication in a complex vector Space Teddy Linear Algebra 3 December 11th, 2009 03:08 PM





Copyright © 2019 My Math Forum. All rights reserved.