Question

Determinati a apartine lui R stiind ca vectorii u=2i+3j si v=(a-1)i + j au aceeasi lungime.

Answer 1

[tex]|u|= \sqrt{a^2+b^2} = \sqrt{2^2+3^2}= \sqrt{4+9} = \sqrt{13}\\\\ |v|= \sqrt{a^2+b^2} = \sqrt{(a-1)^2+1^2}[/tex]