Diket. U = (4 , -3), V = (3 , 2) W = (2 , -1). Ditanya = |u| w.u

diketahui:
u = (4, -3)
v = (3, 2)
w = (2, -1)

ditanya:
|u| w.u

jawab:
|u| = √4² + (-3)² = √16+9 = √25 = 5
w.u = (2i-1j) × (4i-3j) = 8+3 = 11

|u| w.u = 5 × 11 = 55