hang254
  • hang254
Let u = <7, -3>, v = <-9, 5>. Find 4u - 3v.
Mathematics
katieb
  • katieb
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myininaya
  • myininaya
ok u=<7,-3> do you know how to find 4u or 4<7,-3>?
hang254
  • hang254
no, I'm not very good with this topic at all
myininaya
  • myininaya
this is going to blow your mind but this pretty easy to do example: pretend we have u=<1,-2> and we are asked to find 5u 5u=5<1,-2>=<5(1),5(-2)>=<5,-10>

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hang254
  • hang254
alright
myininaya
  • myininaya
so can you evaluate 4<7,-3> now?
hang254
  • hang254
4u-3v=4<7,-3>, -3<-9,5> = <4(7), 4(-3)> = <28,-12> -3(-9), -3(5) = <27, -15>
hang254
  • hang254
so it's <55, -27>
myininaya
  • myininaya
yep that is very good <28,-12>+<27,-15> =<28+27,-12-15> =<55,-27>
hang254
  • hang254
Thank you!
myininaya
  • myininaya
np you did it all

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