4.1 Intro to Matrices

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Chapter 4 Test Review

• 4.1 Intro to Matrices
• 4.2 Operations with Matrices
• 4.3 Multiplying Matrices
• 4.5 Determinants
• 4.7 Inverse Identity Matrices
• 4.8 Using Matrices to Solve Systems of Equations

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Q1 Simplify the expression.
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Q2 Multiply the Matrices
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Q3 Evaluate the __________
Determinant
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The ____ of a matrix tell how many rows and
columns are in the matrix.

• A. Determinant
• B. Dilation
• C. Dimensions
• D. Dementia

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Q4 Evaluate the Determinant
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Which matrices can I multiply?

• A. (2x3) (2x3)
• B. (3x1) (2x3)
• C. (1x4) (2x4)
• D. (1x5) (5x7)

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Q5 Find A-1
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Q6 Are the matrices inverses? Explain.
and
No, because when you multiply AB and BA you dont
get the identity matrix (I).
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We NEVER _______ matrices.

• A. Add
• B. Subtract
• C. Multiply
• D. Divide

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Q7 Multiply the matrices.
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If two matrices are equal, then their __________
elements are equal.

• A. Corresponding
• B. Opposite
• C. Adjacent
• D. Consecutive

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Q9 Solve.
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Q10 Write the system of equations for
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What is the difference between the two
expressions? and

• B. The first is a matrix, the second is a
  Cramer box.
• D. The first is missing a number, the second is
  a determinant.

• A. Youre crazy! There is no difference.
• C. The first is a matrix, the second is a
  determinant.

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Q12 Multiply the Matrices.
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Q13 Find the dimensions of the product
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Q14 Write the matrix equation for
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The inverse of is

• A.
• C.

• B.
• D.