hang254
Let u = <7, -3>, v = <-9, 5>. Find 4u - 3v.
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myininaya
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ok u=<7,-3>
do you know how to find 4u
or 4<7,-3>?
hang254
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no, I'm not very good with this topic at all
myininaya
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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>
hang254
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alright
myininaya
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so can you evaluate 4<7,-3> now?
hang254
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4u-3v=4<7,-3>, -3<-9,5> = <4(7), 4(-3)> = <28,-12>
-3(-9), -3(5) = <27, -15>
hang254
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so it's <55, -27>
myininaya
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yep that is very good
<28,-12>+<27,-15>
=<28+27,-12-15>
=<55,-27>
hang254
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Thank you!
myininaya
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np you did it all