Question

Sendo u = (−4; −2; 4), v = (2; 7; −1) e w = (5; 4; −3), achar o numero ´ u · (v + w)?

Assunto Vetor!!

Answer 1

u=(-4,-2,4)

v=(2,7,-1)

w=(5,4,-3)

somando v+w

v+w=(2+5,7+4,-1-3)

v+w=(7,11,-4)

agora por fim

u×(v+w)=(-4,-2,4)×(7,11,-4)

=(-4×7)+(-2×11)+(4×-4)

=-28-22-16

=-66

[u×(v+w)=-66]

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