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Answer to Question #9687 in Geometry for Ladajah Arnold

Question #9687
if ab=2 and a'b'=3 then the scale factor is ...?
Expert's answer
we have two vectors x=(x1,x2) and y=(y1,y2) then scale product
(x,y)=x1*y1+x2*y2
in our case first vector (a,a') second (b,b') then scale
product will be a * b+a' * b'=2+3=5
so scale product is equal to f5

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