Question

me ajudem nesta questão

Answer 1

A = [0 2 4 4]

[0 3 -1 6]

[0 5 7 10]

[1 6 -2 12]

[0 2 4 4| 0 2 4]

[0 3 -1 6| 0 3 -1]

[0 5 7 10| 0 5 7]

[1 6 -2 12| 1 6 -2]

det A = {[0×3×7×12]+[2×(-1)×10×1]+[4×6×0×6]+[4×0×5×(-2)]}-{[4×3×0×12]+[2×0×10×(-2)]+[0×6×7×6]+[4×(-1)×5×1]} =

det A = {[0×7×12]+[-2×10×1]+[24×0×6]+[0×5×(-2)]}-{[12×0×12]+[0×10×(-2)]+[0×7×6]+[-4×5×1]} =

det A = {[0×12]+[-20×1]+[0×6]+[0×(-2)]}-{[0×12]+[0×(-2)]+[0×6]+[-20×1]} =

det A = {0+[-20]+0+[-0]}-{0+[-0]+0+[-20]} =

{0-20+0-0}-{0-0+0-20} =

{0-20}-{0-20} =

-20-{-20} =

-20+20 =

0 = 0