If B = [bij] is a scalar matrix of n n order such that bii = a for all i = 1, 2, …, n, then the value of determinant Bis equal to
Question
If B = [bij] is a scalar matrix of n n order such that bii = a for all i = 1, 2, …, n, then the value of determinant Bis equal to
Solution
Dado que B es una matriz escalar de orden n × n, donde bii = a para todos i = 1, 2, ..., n, podemos deducir lo siguiente:
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Una matriz escalar es una matriz diagonal donde todos los elementos en la diagonal principal son iguales y todos los elementos fuera de la diagonal principal son cero.
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Por lo tanto, la matriz B se puede escribir como:
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El determinante de una matriz diagonal es el producto de los elementos en la diagonal principal.
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En este caso, todos los elementos en la diagonal principal son a, y hay n de estos elementos.
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Por lo tanto, el determinante de B es:
Entonces, el valor del determinante de B es .
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