Question

if vector a=(-4,5) and vector b=(2-8)
what is ||a-b|| and ||a||-||b||
PLEASE HELP!

Answer 1

are you able to determine what `a-b` is equal to?

Answer 2

yes its (-6, 13)

Answer 3

the answer for ||a-b|| is (-8,10) but I DONT KNOW HOW TO GET THERE

Answer 4

||a-b|| should be a single number

Answer 5

||a-b|| represents the length or magnitude of vector `a-b`

Answer 6

if
a=(-4,5)
b=(2,-8)

then
a-b = (-6, 13)

I agree with what you got for `a-b`

Answer 7

now you use this formula

if z = (m,n)
then
\[\Large ||z|| = \sqrt{m^2 + n^2}\]

Answer 8

Yes I know thats why I got so confused, cause I know that a Magnitude is just a number, but the answer is a coordinate so I don't know what to do or how o get to those coordinates

Answer 9

I'm not sure what they're really asking. Perhaps it's a typo or mixup?

Answer 10

@nicolepenafielm are u sure "the answer is a coordinate"?

The Q asks "what is ||a-b|| and ||a||-||b||" so it could be TWO separate nos even thou they look to be coordinates...

Answer 11

Number 12 is the exercise! please help

Answer 12

sorry is number 11

Answer 13

@nicolepenafielm ur screen shot shows the Q asking to sketch the vectors listed - its completely different from what u posted about | |....

Answer 14

if you're talking about 11c, then

a = (-4,5)
2a = 2*(-4,5)
2a = (2*(-4), 2*5)
2a = (-8, 10)

Answer 15

I think you mixed up 11c and 12c somehow

Answer 16

you are completely right sorry

Answer 17

Linear algebra?