Sendo as matrizes A e B, então o valor de x?

Sendo as matrizes A e B, então o valor de x?

A=

| 1 0 0 |

| 0 -4 0 |

| 0 0 3 |

B=

| 2 0 0 |

| 0 4 0 |

| x 0 2 |

então, o valor de x tal que AB=BA é?

O valor de x é 0 mas não conseguir entender o porque.

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