My Math Forum Scalar coordinate for a length of a vector

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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 $-3^2= -(3^2)$ and $(-3)^2$.

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