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|b| = √(4² + 4² + 2²) = 6
u = b / |b| = (2/3, -2/3, -1/3)
Luego p = a . u = (2, 0, -5) . (2/3, -2/3, -1/3) = 4/3 + 5/3 = 3
Saludos Herminio