Question

Solve for Vt begin{bmatrix}20 & -20 &0&0&0 -20 & 41&-18&0&-3 0 &-18&28&-6&-4 0&0&-6&85&-2 0&-3&-4&-2&23 end{bmatrix}begin{bmatrix}i_t i_1 i_2 i_3 i_4 end{bmatrix}=begin{bmatrix}v_t 0 0 0 0 end{bmatrix}

Matrices
ANSWERED
asked 2020-11-24
Solve for Vt
\(\begin{bmatrix}20 & -20 &0&0&0 \\-20 & 41&-18&0&-3 \\ 0 &-18&28&-6&-4 \\0&0&-6&85&-2 \\ 0&-3&-4&-2&23 \end{bmatrix}\begin{bmatrix}i_t \\ i_1 \\ i_2 \\ i_3 \\ i_4 \end{bmatrix}=\begin{bmatrix}v_t \\ 0 \\ 0 \\ 0 \\ 0 \end{bmatrix}\)

Answers (1)

2020-11-25
Step 1
In linear algebra, matrix multiplication is a binary operation that produces a matrix from two matrices. For matrix multiplication, the number of columns in the first matrix must be equal to the number of rows in the second matrix. The resulting matrix, known as the matrix product, has the number of rows of the first and the number of columns of the second matrix. The product of matrices A and B is then denoted simply as AB.
Step 2
\(\begin{bmatrix}20 & -20 &0&0&0 \\-20 & 41&-18&0&-3 \\ 0 &-18&28&-6&-4 \\0&0&-6&85&-2 \\ 0&-3&-4&-2&23 \end{bmatrix}\begin{bmatrix}i_t \\ i_1 \\ i_2 \\ i_3 \\ i_4 \end{bmatrix}=\begin{bmatrix}v_t \\ 0 \\ 0 \\ 0 \\ 0 \end{bmatrix}\)
\(20i_t-20i_1=v_t\)
\(-20i_t+41i_t-18i_2-3i_4=0\)
\(-18i_1+28i_2-6i_3-4i_4=0\)
\(-6i_2+85i_3-2i_4=0\)
\(-3i_1-4i_2-2i_3+23i_4=0\)
Let \(i_3=m , i_4=n\)
\(-18i_1+28i_2=6m+4n\)
\(-3i_1-4i_2=2m-23n\)
solving above two equations we get
\(i_1=\frac{157n-20m}{39} , i_2=\frac{71n-3m}{26}\)
\(i_t=\frac{41}{20}\frac{157n-20m}{39}-\frac{18}{20}\frac{71n-3m}{26}-\frac{3}{20}n\)
So, \(v_t=20\left(\frac{41}{20}\frac{157n-20m}{39}-\frac{18}{20}\frac{71n-3m}{26}-\frac{3}{20}n-\frac{157n-20m}{39}\right)\)
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