Question

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determinati "A" pt care vectorii V= 2 i+(a+1) j si V = i+ 2 i

Answer 1

in caz ca sunt perpendiculari ai formula a1a2+b1b2=0 adica 2+2a+2=0<=>2a+4=0<=>2a=-4=>a=-2
in caz ca sunt coliniari $\frac{a1}{a2}= \frac{b1}{b2}$≠$\frac{c1}{c2}$ <=> $2= \frac{a+1}{2} \ \textless \ =\ \textgreater \ 4=a+1=\ \textgreater \ a=3$