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C=[[1,4],[4,-1],[3,-2]] and

D=[[-2,2],[3,0]]
Let 
H=CD. Find 
H.

H=

C=[1amp;44amp;13amp;2] \mathrm{C}=\left[\begin{array}{rr}1 & 4 \\ 4 & -1 \\ 3 & -2\end{array}\right] and D=[2amp;23amp;0] \mathrm{D}=\left[\begin{array}{rr} -2 & 2 \\ 3 & 0 \end{array}\right] \newlineLet H=CD \mathrm{H}=\mathrm{CD} . Find H \mathrm{H} .\newlineH= \mathbf{H}=

Full solution

Q. C=[144132] \mathrm{C}=\left[\begin{array}{rr}1 & 4 \\ 4 & -1 \\ 3 & -2\end{array}\right] and D=[2230] \mathrm{D}=\left[\begin{array}{rr} -2 & 2 \\ 3 & 0 \end{array}\right] \newlineLet H=CD \mathrm{H}=\mathrm{CD} . Find H \mathrm{H} .\newlineH= \mathbf{H}=
  1. Understand matrix multiplication rules: Understand matrix multiplication rules.\newlineTo multiply two matrices, the number of columns in the first matrix must be equal to the number of rows in the second matrix. Matrix CC is a 3×23 \times 2 matrix and matrix DD is a 2×22 \times 2 matrix. Since the number of columns in CC (which is 22) is equal to the number of rows in DD (which is 22), we can multiply these matrices.
  2. Set up the multiplication: Set up the multiplication.\newlineWe will calculate the elements of matrix HH by taking the dot product of the rows of matrix CC with the columns of matrix DD. The resulting matrix HH will have the same number of rows as matrix CC and the same number of columns as matrix DD, so HH will be a 3×23 \times 2 matrix.
  3. Calculate first element of H: Calculate the first element of matrix HH. The first element of matrix HH (H[1,1]H[1,1]) is the dot product of the first row of CC and the first column of DD. H[1,1]=(1)(2)+(4)(3)H[1,1] = (1)(-2) + (4)(3) H[1,1]=2+12H[1,1] = -2 + 12 H[1,1]=10H[1,1] = 10
  4. Calculate second element of first row: Calculate the second element of the first row of matrix HH. The second element of the first row of matrix HH (H[1,2]H[1,2]) is the dot product of the first row of CC and the second column of DD. H[1,2]=(1)(2)+(4)(0)H[1,2] = (1)(2) + (4)(0) H[1,2]=2+0H[1,2] = 2 + 0 H[1,2]=2H[1,2] = 2
  5. Calculate first element of second row: Calculate the first element of the second row of matrix HH. The first element of the second row of matrix HH (H[2,1]H[2,1]) is the dot product of the second row of CC and the first column of DD. H[2,1]=(4)(2)+(1)(3)H[2,1] = (4)(-2) + (-1)(3) H[2,1]=83H[2,1] = -8 - 3 H[2,1]=11H[2,1] = -11
  6. Calculate second element of second row: Calculate the second element of the second row of matrix HH. The second element of the second row of matrix HH (H[2,2]H[2,2]) is the dot product of the second row of CC and the second column of DD. H[2,2]=(4)(2)+(1)(0)H[2,2] = (4)(2) + (-1)(0) H[2,2]=8+0H[2,2] = 8 + 0 H[2,2]=8H[2,2] = 8
  7. Calculate first element of third row: Calculate the first element of the third row of matrix HH. The first element of the third row of matrix HH (H[3,1]H[3,1]) is the dot product of the third row of CC and the first column of DD. H[3,1]=(3)(2)+(2)(3)H[3,1] = (3)(-2) + (-2)(3) H[3,1]=66H[3,1] = -6 - 6 H[3,1]=12H[3,1] = -12
  8. Calculate second element of third row: Calculate the second element of the third row of matrix HH. The second element of the third row of matrix HH (H[3,2]H[3,2]) is the dot product of the third row of CC and the second column of DD. H[3,2]=(3)(2)+(2)(0)H[3,2] = (3)(2) + (-2)(0) H[3,2]=6+0H[3,2] = 6 + 0 H[3,2]=6H[3,2] = 6

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