anonymous
  • anonymous
Let v = (1,-3) and w = (-2,6). Which of the following is true? ***choose ALL that apply!!**** A. v x w = 36 B. The x-component of v is -2. C. The y-component of w is 6. D. w = -2v **not sure how to do this :( @terenzreignz how do you solve this? :D
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@terenzreignz :)
anonymous
  • anonymous
C
terenzreignz
  • terenzreignz
uh-oh a cross product... uhhh

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More answers

anonymous
  • anonymous
but how did you get that? :/ and also it's choose ALL that apply... i don't get how to get to the solution though :( ooh! yay :) ur here :)
terenzreignz
  • terenzreignz
Which ones have you checked?
anonymous
  • anonymous
idk how to check them really :( like for A, when it says v x w=36.. how do i multiply (1,-3) and (-2,6) ?? is it like FOIL kinda?:/
terenzreignz
  • terenzreignz
ehh, not exactly... cross product.... by any chance, do you know how to get determinants of matrices?
anonymous
  • anonymous
errr not really :( how do u do that?
anonymous
  • anonymous
well, at least i don't think i know it haha :P
terenzreignz
  • terenzreignz
okay, then...
terenzreignz
  • terenzreignz
Let's just use a formula for cross products?
anonymous
  • anonymous
kk :)
terenzreignz
  • terenzreignz
sorry, I mean v x w
anonymous
  • anonymous
kk... :/ yeah it looks monstrous haha :/ how do i plug that in? :/
terenzreignz
  • terenzreignz
well, are the components of v while are the components of w.
anonymous
  • anonymous
v = (1,-3) and w = (-2,6) so do multiply them in a FOIL-like method? :/
terenzreignz
  • terenzreignz
Wait a minute... I'm such a...
anonymous
  • anonymous
*do i
terenzreignz
  • terenzreignz
Sorry, (a) is clearly not true... cross product is ONLY DEFINED for 3-dimensional vectors...
anonymous
  • anonymous
okay i see :) so its narrowed down to B,C, and D! :)
terenzreignz
  • terenzreignz
Well, as for B...
anonymous
  • anonymous
but idk how to see if any of B,C, or D are true :/
terenzreignz
  • terenzreignz
what IS the x-component of v?
anonymous
  • anonymous
1?
terenzreignz
  • terenzreignz
Yup.... definitely not -2
anonymous
  • anonymous
ohh so B is FALSE right? cuz -2 is the x component for w!
anonymous
  • anonymous
okay, so C is an answer right? cuz y for w= 6.. is that right? :D
terenzreignz
  • terenzreignz
strictly speaking, simply because -2 is NOT the x-component of v :D
anonymous
  • anonymous
haha :) yup!!
terenzreignz
  • terenzreignz
C... check it :D
anonymous
  • anonymous
yay! kk :) what about D tho? :/
terenzreignz
  • terenzreignz
What about C?
anonymous
  • anonymous
oh haha oops i said that above lol :P okay, so C is an answer right? cuz the y component for w= 6.. is that right? :D
terenzreignz
  • terenzreignz
yes... now check D...
anonymous
  • anonymous
-2(1,-3) = -2, 6 which is the same as w!! so C and D are the answers then!? :)
terenzreignz
  • terenzreignz
Yes. Very good :D
anonymous
  • anonymous
awesome! thank you so much! :D
anonymous
  • anonymous
awesome! thank you so much! :D

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