Question

@miracrown

Find a-b
a = 6i - 6j
b = 4i + 2j


Personally, I think there is a typo in the problem because I am getting < 2, -4 >, but that isn't an option

Answer 1

This is working with vectors

Answer 2

-6-2?

Answer 3

That should have been -8, my mind is going everywhere right now

Answer 4

I think you forgot to distribute the negative

Answer 5

I did 6-4 and -6-2

Answer 6

Well, your i-component is right. Your y-component is wrong
Yes, -6-2 = -8
so it should be <2, -8>

Answer 7

That still isn't an option ;-;

Answer 8

@sleepyjess does your question ask something rather than just finding a-b
or like are you not seeing 2i-8j
?

Answer 9

No, that is all it says

Answer 10

did they want a dot b?

Answer 11

that minus doesn't look like a dot :p

Answer 12

I only have one contact right now, but I don't think I'm that blind :P

Answer 13

but I do see an option that is correct if it was a dot

Answer 14

or a - b? a dot b is much different than a - b.

Answer 15

I thought about that, let me see if that comes out to any of them

Answer 16

you know where I look at that -
it looks more like the negative signs than the minus signs in other places in this document

Answer 17

That comes out to 12, so I guess they want the dot product

Answer 18

It clearly doesn't say a+b, but one of the choices is a+b. Strange.

Answer 19

But it is a - , not dot product

Answer 20

I think it is the dot product of a and -b

Answer 21

right, it's 12 if you use dot product ... I'm not quite sure where the other choices are coming from

Answer 22

that is a negative sign not a minus

Answer 23

look at the rest of the document

Answer 24

\(\color{blue}{\text{Originally Posted by}}\) @sleepyjess
But it is a - , not dot product
\(\color{blue}{\text{End of Quote}}\)
oh then yes, our answer is right then

Answer 25

the minus sign is bigger than the negative sign

Answer 26

Okay, thanks to both of you :)

Answer 27

either way this problem is totally messed up