Question

Знайти координати вектора.c=4b+3a,якщо а(-5;3)b(2,7-0,85)

Answer 1

$c = 4b + 3a \\ 4b = (4 \times 2.7;4 \times ( - 0.85)) = \\ = (1.08; - 3.4)$

$3a = (3 \times ( - 5);3 \times 3) = ( - 15;9)$

$c = (1.08 - 15; - 3.4 + 9) = (13.92;5.6)$