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Encuentre la matriz transpuesta pedida [tex]$(-\frac{1}{2} A)^{\top}[tex]$[/tex], si [tex]$[/tex]A=\left[\begin{array}{rrr}4 & -2 & -2 \\ -2 & 10 & 2 \\ 2 & 2 & 6\end{array}\right][tex]$[/tex]. Entonces [tex]$[/tex](-\frac{1}{2} A)^{\top}=$[/tex]?

Seleccione una:
a. [tex]$\left[\begin{array}{rrr}-2 & 1 & -1 \\ 1 & -1 & -3 \\ 1 & -5 & -1\end{array}\right]$[/tex]
b. [tex]$\left[\begin{array}{rrr}1 & -1 & -3 \\ 1 & -5 & -1 \\ -2 & 1 & -1\end{array}\right]$[/tex]
c. [tex]$\left[\begin{array}{rrr}1 & -5 & -1 \\ -2 & 1 & -1 \\ 1 & -1 & 3\end{array}\right]$[/tex]
d. [tex]$\left[\begin{array}{rrr}-2 & 1 & -1 \\ 1 & -5 & -1 \\ 1 & -1 & -3\end{array}\right]$[/tex]

Sagot :

Para resolver este problema, primero debemos encontrar la matriz \( -\frac{1}{2} A \) y luego calcular su transpuesta.

La matriz \( A \) que se nos da es:
[tex]\[ A = \left[\begin{array}{rrr} 4 & -2 & -2 \\ -2 & 10 & 2 \\ 2 & 2 & 6 \end{array}\right] \][/tex]

Multiplicamos esta matriz por \( -\frac{1}{2} \):

[tex]\[ -\frac{1}{2} A = -\frac{1}{2} \left[\begin{array}{rrr} 4 & -2 & -2 \\ -2 & 10 & 2 \\ 2 & 2 & 6 \end{array}\right] = \left[\begin{array}{rrr} -2 & 1 & 1 \\ 1 & -5 & -1 \\ -1 & -1 & -3 \end{array}\right] \][/tex]

Ahora calculamos la transpuesta de \( -\frac{1}{2} A \). Recordemos que para transponer una matriz, intercambiamos las filas por columnas:

[tex]\[ \left( -\frac{1}{2} A \right)^{\top} = \left[\begin{array}{rrr} -2 & 1 & 1 \\ 1 & -5 & -1 \\ 1 & -1 & -3 \end{array}\right]^{\top} = \left[\begin{array}{rrr} -2 & 1 & 1 \\ 1 & -5 & -1 \\ 1 & -1 & -3 \end{array}\right] \][/tex]

Comparando nuestra matriz transpuesta calculada con las opciones dadas, vemos que coincide con la opción:

d. \(\left[\begin{array}{rrr} -2 & 1 & -1 \\ 1 & -5 & -1 \\ 1 & -1 & -3 \end{array}\right]\)

Por lo tanto, la respuesta correcta es la opción d.
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