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{:[E=[[5,3],[-2,1],[4,1]]" and "],[D=[[-2,-1],[5,0]]]:}
Let 
H=ED. Find 
H.

H=

E=[5amp;32amp;14amp;1] and D=[2amp;15amp;0] \begin{array}{l} \mathrm{E}=\left[\begin{array}{rr} 5 & 3 \\ -2 & 1 \\ 4 & 1 \end{array}\right] \text { and } \mathrm{D}=\left[\begin{array}{rr} -2 & -1 \\ 5 & 0 \end{array}\right] \end{array} \newlineLet H=ED \mathrm{H}=\mathrm{ED} . Find H \mathrm{H} .\newlineH= \mathbf{H}=

Full solution

Q. E=[532141] and D=[2150] \begin{array}{l} \mathrm{E}=\left[\begin{array}{rr} 5 & 3 \\ -2 & 1 \\ 4 & 1 \end{array}\right] \text { and } \mathrm{D}=\left[\begin{array}{rr} -2 & -1 \\ 5 & 0 \end{array}\right] \end{array} \newlineLet H=ED \mathrm{H}=\mathrm{ED} . Find H \mathrm{H} .\newlineH= \mathbf{H}=
  1. Matrix Multiplication: Matrix multiplication involves taking the rows of the first matrix EE and the columns of the second matrix DD and performing dot products to get the entries of the resulting matrix HH. The dimensions of EE are 3×23 \times 2 and the dimensions of DD are 2×22 \times 2. Since the number of columns in EE is equal to the number of rows in DD, we can multiply these matrices. The resulting matrix HH will have dimensions 3×23 \times 2.
  2. Entry in H[1,1]H[1,1]: To find the entry in the first row and first column of HH, we take the dot product of the first row of EE with the first column of DD.\newlineH[1,1]=(5×2)+(3×5)=10+15=5H[1,1] = (5 \times -2) + (3 \times 5) = -10 + 15 = 5.
  3. Entry in H[1,2]H[1,2]: To find the entry in the first row and second column of HH, we take the dot product of the first row of EE with the second column of DD.H[1,2]=(5×1)+(3×0)=5+0=5H[1,2] = (5 \times -1) + (3 \times 0) = -5 + 0 = -5.
  4. Entry in H[2,1]H[2,1]: To find the entry in the second row and first column of HH, we take the dot product of the second row of EE with the first column of DD.H[2,1]=(2×2)+(1×5)=4+5=9H[2,1] = (-2 \times -2) + (1 \times 5) = 4 + 5 = 9.
  5. Entry in H[2,2]H[2,2]: To find the entry in the second row and second column of HH, we take the dot product of the second row of EE with the second column of DD.H[2,2]=(2×1)+(1×0)=2+0=2H[2,2] = (-2 \times -1) + (1 \times 0) = 2 + 0 = 2.
  6. Entry in H[3,1]H[3,1]: To find the entry in the third row and first column of HH, we take the dot product of the third row of EE with the first column of DD.H[3,1]=(4×2)+(1×5)=8+5=3H[3,1] = (4 \times -2) + (1 \times 5) = -8 + 5 = -3.
  7. Entry in H[3,2]H[3,2]: To find the entry in the third row and second column of HH, we take the dot product of the third row of EE with the second column of DD.H[3,2]=(4×1)+(1×0)=4+0=4H[3,2] = (4 \times -1) + (1 \times 0) = -4 + 0 = -4.

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