PCH Unit 5 Matrices REVIEW for Retake

• a

• b

• c

• d

• a

• b

• c

• d

Given matrix A, find A^-1.

• -24

• 0

• 12

• No inverse

• [11 8]

  [ 4 -2]

• [ 3 2 ]

  [-6 -6]

• [-3 2 ]

  [-4 -6]

• [11 8]

  [-4 2 ]

• [3 -8]

  [0 -1 ]

• [3 -4 ]

  [8 -13]

• [-3 8]

  [0 1]

• [3 -8]

  [-8 1]

Calculate the determinant

• 0
• -15
• -70
• 10

Find 3B - 2A

• [22 25]

  [17 3]

• [14 5]

  [-11 3]

• [-14 5]

  [11 -3]

• none of these

find: BA

• [47 30]

  [ 9 5 ]

• [17 15]

  [42 35]

• [10 25]

  [ 7 1 ]

• none of these

Solve the system using inverse matrices or Cramer's rule.

-5x + 5y = -10

-7x + 4y = 13

• (-7, -5)

• (-7, -9)

• (7, -9)

• (-7, 5)

Find the determinant of the matrix

• A

• B

• C

• D