Question

u = [-.6]
[ .8]
compute the lengths ||u||

I thought to compute ||u|| you multiply the absolute value of u * u then take the square root. That would be .6 * .8 which is .48
The square root of that is roughly .7
The book says the answer is 1
what am I doing wrong.

Answer 1

I assume [ . ] -->Greatest integer function(GIF)
Is my assumption correct??

Answer 2

And why u has 2 values??

Answer 3

@robert_ford80 ??

Answer 4

it's a linear algebra problem

Answer 5

LOL. you should be using equation editor to write the question :D

Answer 6

ok

Answer 7

yes

Answer 8

Ok. Your doubt is in part 2 of the question.

Basically
\[||u||=|u|=\sqrt{(-0.6)^2 + (0.8)^2}\]
Now you can try the rest :D

Answer 9

Therefore |u| = 1

Answer 10

ok, i got it. thanks