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Find a • b. a = 5i + 7j, b = -4i + 3j

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calculus

asked Aug 8, 2014 in CALCULUS by Tdog79 Pupil
reshown Aug 8, 2014 by bradely

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1 Answer

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a =<5,7> b =<-4,3>

a ⋅ b is a scaler product

if a =<x1,y1> b= <x2,y2>

a ⋅ b =x1x2+y1y2

a ⋅ b =(5)(-4)+(7)(3)

=-20+21

=1

answered Aug 8, 2014 by anonymous

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