Q. C=⎣⎡1434−1−2⎦⎤ and D=[−2320]Let H=CD. Find H.H=
Understand matrix multiplication rules: Understand matrix multiplication rules.To multiply two matrices, the number of columns in the first matrix must be equal to the number of rows in the second matrix. Matrix C is a 3×2 matrix and matrix D is a 2×2 matrix. Since the number of columns in C (which is 2) is equal to the number of rows in D (which is 2), we can multiply these matrices.
Set up the multiplication: Set up the multiplication.We will calculate the elements of matrix H by taking the dot product of the rows of matrix C with the columns of matrix D. The resulting matrix H will have the same number of rows as matrix C and the same number of columns as matrix D, so H will be a 3×2 matrix.
Calculate first element of H: Calculate the first element of matrix H. The first element of matrix H (H[1,1]) is the dot product of the first row of C and the first column of D. H[1,1]=(1)(−2)+(4)(3)H[1,1]=−2+12H[1,1]=10
Calculate second element of first row: Calculate the second element of the first row of matrix H. The second element of the first row of matrix H (H[1,2]) is the dot product of the first row of C and the second column of D. H[1,2]=(1)(2)+(4)(0)H[1,2]=2+0H[1,2]=2
Calculate first element of second row: Calculate the first element of the second row of matrix H. The first element of the second row of matrix H (H[2,1]) is the dot product of the second row of C and the first column of D. H[2,1]=(4)(−2)+(−1)(3)H[2,1]=−8−3H[2,1]=−11
Calculate second element of second row: Calculate the second element of the second row of matrix H. The second element of the second row of matrix H (H[2,2]) is the dot product of the second row of C and the second column of D. H[2,2]=(4)(2)+(−1)(0)H[2,2]=8+0H[2,2]=8
Calculate first element of third row: Calculate the first element of the third row of matrix H. The first element of the third row of matrix H (H[3,1]) is the dot product of the third row of C and the first column of D. H[3,1]=(3)(−2)+(−2)(3)H[3,1]=−6−6H[3,1]=−12
Calculate second element of third row: Calculate the second element of the third row of matrix H. The second element of the third row of matrix H (H[3,2]) is the dot product of the third row of C and the second column of D. H[3,2]=(3)(2)+(−2)(0)H[3,2]=6+0H[3,2]=6
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