Exerc 4 Lista 3

u = (2,-1,3)\nu // u => u = α u\nu . J = -42\nu . α . u = -42\nα u . u = -42\nα |1|^2 = -42\nα [√(2+(-1)²)+(3)]² = -42\nα [√(14)]² = -42\nα = -3 u = α u\nJ = -3(2,-1,3)\nu = (-6,3,-9)