Question

Dados os vetores A = 3 i - 4 j, B = 5 i + 8 j e C = -3 i + 2 j, determine os valores de:
(a) A-B;
(b) A+3C-5B;
(c) A+B;
(d) |A|;
(e) |A+C|

Answer 1

(a)(3i-4j)-(5i+8j)
 =2i-12
(b)(3i-4j)+3*(-3i+2j)-5*(5i+8j)
 (3i-4)+(-9i+6j)-(25i+45j)
-31i+47j
(c)3i-4j+5i+8j
 8i+4j
d)3i+4j
e)9i+6j