Matrix Multiplication Concepts

The video tutorial explains how to multiply two matrices by first checking if the multiplication is possible. It covers the conditions required for matrix multiplication, such as matching the number of columns in the first matrix with the number of rows in the second. The tutorial then describes how to determine the dimensions of the resulting product matrix and provides a step-by-step guide to calculating each element in the product matrix by multiplying rows and columns. The video concludes with a review of the completed matrix product.

What must be true for the product of two matrices to be possible?

• Both matrices must have the same number of columns.

• Both matrices must have the same number of rows.

• The number of rows in the first matrix must equal the number of columns in the second matrix.

• The number of columns in the first matrix must equal the number of rows in the second matrix.

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CCSS.HSN.VM.C.8

What are the dimensions of the product matrix when multiplying a 2x2 matrix with another 2x2 matrix?

• 2x4

• 4x2

• 4x4

• 2x2

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CCSS.HSN.VM.C.8

How do you determine the elements of the product matrix?

• By dividing the elements of the first matrix by the second matrix.

• By subtracting the elements of the second matrix from the first matrix.

• By multiplying rows from the first matrix with columns from the second matrix.

• By adding the corresponding elements of the two matrices.

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CCSS.HSN.VM.C.8

What is the result of multiplying the first row of the first matrix with the first column of the second matrix?

• 8

• 0

• 4

• -4

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CCSS.HSN.VM.C.8

What is the formula used to calculate the element in row one, column one of the product matrix?

• -2 * -4 + 4 * -3

• -3 * -4 + -2 * 4

• -4 * -2 + -3 * 4

• -4 * 4 + -3 * -2

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CCSS.HSN.VM.C.8

What is the result of multiplying the first row of the first matrix with the second column of the second matrix?

• -3

• -12

• -15

• 0

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CCSS.HSN.VM.C.8

What is the formula used to calculate the element in row one, column two of the product matrix?

• -4 * 1 + -3 * 3

• -3 * 3 + -4 * 1

• -3 * 1 + -4 * 3

• -4 * 3 + -3 * 1

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CCSS.HSN.VM.C.8

What is the result of multiplying the second row of the first matrix with the first column of the second matrix?

• 0

• 8

• 4

• -4

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CCSS.HSN.VM.C.8

What is the formula used to calculate the element in row two, column one of the product matrix?

• -4 * -2 + -2 * 2

• -2 * 4 + -2 * -2

• -2 * -2 + -2 * 4

• -2 * 2 + -4 * -2

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CCSS.HSN.VM.C.8

What is the result of multiplying the second row of the first matrix with the second column of the second matrix?

• 8

• -8

• 0

• 4

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CCSS.HSN.VM.C.8