Question

fie vectori a=2i+j. b=2j+3j

Answer 1

$a=2i+j\\b=2i+3j\\\\a) 2-a-3b=2-(2i+j)-3(2i+3j)=2-2i-j-6i-9j=-8i-10j+2\\\\b)4(2i+j)+2(2i+3j)=8i+4j+4i+6j=12i+10j$