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March 4th, 2015, 03:17 PM  #1 
Member Joined: Jan 2015 From: Norway Posts: 95 Thanks: 1  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. ? 
March 4th, 2015, 03:33 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 3,003 Thanks: 1588 
$(3)^2 = 9$

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 . 

Tags 
coordinate, cordinate, length, scalar, vector 
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