Question

Dados os vetores u=(1,-1) e w=(8,-6) calcule:
|2u - w|

Answer 1

2u - w = 2 . (1, -1) - (8, -6) 

2u - w = (2, -2) - (8, -6) 

2u - w = (-6, 4) 

| 2u - w | = √((-6)² + 4²) 
| 2u - w | = √(36 + 16) 
| 2u - w | = √52 
| 2u - w | = √(2² . 13) 
| 2u - w| = 2√13