Question

dados os vetores a=(1 2 1) e b=(2 1 0) calcular 2a x (a+b)?

Answer 1

Boa noite

a = (1, 2, 1)
b = (2, 1, 0)

2a = (2, 4, 2)
a + b = (3, 3, 1)

2a*(a + b) = (2, 4, 2)*(3, 3, 1) = 6 + 12 + 2 = 20