A (-3;2) B (2;1) C(1;-4) D (-1;2) Найти |2AB+3CD|

Question

A (-3;2) B (2;1) C(1;-4) D (-1;2) Найти |2AB+3CD|

Answer 1

А)|2*-3*2-3*1*1|=|-15|=15
б)|2*2*1+3*-4*2|=|4-24|=|-20|=20