Question

Найдите | a− 3⃗b |, если a {–2; 11; 2},b {1; 4; –1}

Answer 1

{–2; 11; 2}-3{1; 4; –1}={–2; 11; 2}- {3;12; –3}={-5;-1; 5}

| a− 3⃗b |=√(25+1+25)=√51