Desmos Matrices

What are the dimensions of this matrix?

• 3x1

• 1x3

• 3x3

• 1x1

In Matrix R (pictured) what element is a₂₃?

• 8

• 9.01

• 6

• 1

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be equal.

• The determinant can't equal 0.

• The column of the 1st must equal the row of the 2nd.

Will this matrix have an inverse?

• Yes

• No

• Unable to Determine

What is the inverse of this matrix? Calculate by hand.

• _{(1/25) (-4/25)}

  _{(3/25) (13/25)}

• _{(1/5) (-4/5)}

  _{(3/5) (13/5)}

• _{(6/25) (-2/25)}

  _{(2/25) (9/25)}

• _{(1/150) (-4/150)}

  _{(3/150) (13/150)}

Calculate the determinant using the Desmos calculator.

• 0

• -15

• -70

• 10

Find the inverse using the Desmos calculator.

• A

• B

• C

• D

Add

• 11    8
  -4     2

• 3     2
  -6    -6

• -3    2
  -4    -6

• 10    8
  -6    2

Perform the indicated operation using the Desmos calculator. If it’s not possible, select Not Possible.

• 7

  -7

  -6

  20

• 7

  -9

  -6

  20

• Not Possible

• 7

  -9

  2

  20

Calculate the determinant

• 0

• -15

• -70

• 10