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Consider the following two vectors of R3: u =(-20,-8,-4)and v =(20,c,4) where c is an unknown. (a) For what value of c do we have

Consider the following two vectors of R3:

u =(-20,-8,-4)and v =(20,c,4) where c is an unknown.

(a) For what value of c do we have that u and v are collinear?

Answer: c=

(b) For what value of c do we have that u and v are perpendicular (orthogonal)?

Answer: c=

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