diketahui vektor u=2i+3j-2k dan vektor v=ai-2j+4k x jika u x v=-4 hasil u+v

U=(2,3,-2)
V=(a,-2,4)
U.V = -4
(2,3,-2).(a,-2,4) =-4
2a-6-8 = -4
2a-14 = -4
a = 5
U+V =(2,3,-2)+(5,-2,4)
U+V =(7,1,2)