Question

Determinati a apartine IR astfel incat vectorii u si v sa fie coliniari,unde:

a)u(3,-4) , v(a,8)
c)u(1-2),v(a-1,3a)

Dau funda

Answer 1

Răspuns:

a.u(3,-4)=v(a,8)

$\frac{3}{a} =\frac{-4}{8}=> \frac{3}{a} } =\frac{-1}{2}$

-=>3*2= -a

a= -6

b.u(1,-2) v(a-1,3a)

$\frac{1}{a-1} =\frac{-2}{3a} =>3a*1=-2(a-1)=>3a=-2a+2=>5a=2=>\\a=\frac{2}{5}$

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