ACT no.3-2020 Matrices

• 1 -2

  1 -2

• -1 2

  -1 -2

• 1 2

  3 0

• 3 0

  3 0

The value of B – 2Ais:

• 0 2

  -3 0

• -2 2

  -3 3

• -1 2

  -1 -2

• 1 2

  3 0

• Cannot be determined

The value of BA is:

• 4 -2

  3 -1

• 0 2

  1 3

• 4 2

  3 -1

• 0 2

  3 3

• Cannot be determined

• -12

• -6

• 0

• 6

• 12

• 3bx-2ay

• 3bx+2ay

• 3bx

  2ay

• 3bx 0

  2ay -2ax

• 3bx -3by

  -2ax 2ay

• -2xz

• 6x-8z

• 6x -7z 8

• 6x 0 -6z

  7x 0 -7z

  8x 0 -8z

• 6x

  0

  -8z

• α = a2 + b2, β = ab

• α = a2 + b2, β = 2ab

• α = a2 + b2, β = a2 – b2

• α = 2ab, β = a2 + b2

• 
• 
• 
• None of These

For any square matrix A, AA^t is a

• unit matrix

• symmetric matrix

• skew-symmetric matrix

• diagonal matrix

• a skew-symmetric matrix

• a symmetric matrix

• a diagonal matrix

• an upper triangular matrix