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Let u = <7, -3>, v = <-9, 5>. Find 4u - 3v.

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vectors

asked Jul 30, 2014 in TRIGONOMETRY by anonymous

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1 Answer

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u=<7,-3> and v=<-9,5>

First calculate 4u

4u = 4<7,-3>

=<4(7),4(-3)>

=<28,-12>

Next find 3v

3v=3<-9,5>

=<3(-9),3(5)>

=<-27,15>

4u-3v= <28,-12>-<-27,15>

=<(28-(-27)),(-12-15)>

=<55,-27>

answered Jul 30, 2014 by bradely Mentor

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