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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

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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:

  1. 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.

  2. Por lo tanto, la matriz B se puede escribir como: B=(a0000a0000a0000a) B = \begin{pmatrix} a & 0 & 0 & \cdots & 0 \\ 0 & a & 0 & \cdots & 0 \\ 0 & 0 & a & \cdots & 0 \\ \vdots & \vdots & \vdots & \ddots & \vdots \\ 0 & 0 & 0 & \cdots & a \end{pmatrix}

  3. El determinante de una matriz diagonal es el producto de los elementos en la diagonal principal.

  4. En este caso, todos los elementos en la diagonal principal son a, y hay n de estos elementos.

  5. Por lo tanto, el determinante de B es: det(B)=aaaa=an \det(B) = a \cdot a \cdot a \cdots a = a^n

Entonces, el valor del determinante de B es an a^n .

This problem has been solved

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