Question

How would you keep going from here ?
-4i²+16ij-4j²

Answer 1

i think that is simplified . can't go any further i don't think. unless its a foil/factoring problem

Answer 2

It was a foil/factoring problem at first, then I got to that, then i'm stuck
but that's not the answer though :|

Answer 3

okay gimme a sec to work it out

Answer 4

ok

Answer 5

Can I have the original question?

Answer 6

4(-i^2+4I+1j^2) . . might need to get someone to double check that

Answer 7

Let V = -4i+j and W = i-4j
Solve: V x W

Answer 8

i not a math genious sowweh i dont think im right :/

Answer 9

what is that number/letter in the middle? is that 41 or 4l ?

Answer 10

doing it, give me a sec.

Answer 11

Original equation: Let V = -4i+j and W = i-4j
Solve: V x W

Answer 12

Ok !

Answer 13

-4x^2 + 16ji -4j^2

Answer 14

17 my bad

Answer 15

17 in the middle ?

Answer 16

yes

Answer 17

how ?

Answer 18

i got : -4i²+16ij-4j² though O_O

Answer 19

(-4+j) (i-4j) = -4i^2 + 16ji + ji -4j^2

Answer 20

yea, that's what i got earlier :D

Answer 21

but i dont know how to keep going from there ?

Answer 22

the answer is -8 btw

Answer 23

hold on

Answer 24

I don't understand how you can get 8 from that.

Answer 25

Are you sure you're reading the answer correctly?

Answer 26

Yes, it's -8

Answer 27

That's just not possible. If the question is just asking V x W, there's nothing more you can do.

Answer 28

ahh i know what's wrong now lol, it's not multiplying it's dealing with something called Dot Product

Answer 29

Sorry everyone :|

Answer 30

Well, you should post the full instructions next time

Answer 31

well the instruction did not say Dot Product, but it just simply V dot W, like a little multiplying dot in the middle, so i thought it's multiply =.=

Answer 32

But my fault :|

Answer 33

Like I said, you should post the question you were working on to begin with. What you have posted originally is not really a question that can be properly addressed.