2. (a) Find egin{bmatrix} 1 & 2 & 3 \ 4 & 5 & 6 end{bmatrix} egin{bmatrix} 1 \ 2 end{bmatrix} (b) Find egin{bmatrix} 9 & -2 \ 1 & 7 end{bmatrix} egin{bmatrix} 1 \ 2 end{bmatrix} (c) Find egin{bmatrix} 1 & 2 & -7 & -1 \ 3 & 6 & -2 & 5 end{bmatrix} egin{bmatrix} 4 \ 8 \ 3 \ 1 end{bmatrix} (d) Solve for x_1, x_2, x_3, x_4 in egin{bmatrix} 1 & 2 & -7 & -1 \ 3 & 6 & -2 & 5 end{bmatrix} egin{bmatrix} x_1 \ x_2 \ x_3 \ x_4 end{bmatrix} = vec{0}.
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