Question

Please help me answer this

Answer 1

Answer:

option c

Step-by-step explanation:

Step 1: Multiply each number in matrix A by -4

( -4x-4    -4x-4    1x-4  )          

( 1x-4      4x-4      7x-4)    

( 2x-4     3x-4      3x-4)

( 16       16     -4 )

( -4      -16    -28)        

( -8     -12      -12)

Step 2: Multiply each number in matrix B by 8

( 2x8    9x8    -9x8  )

( 8x8    8x8     -2x8 )    

( 4x8    10x8      1x8 )

( 16    72    -72  )

( 64    64    -16  )    

(32     80      8  )

Step 3: Form the matrix of -4A + 8B by adding the correspondent numbers in the matrix.

( 16+16   16+72    -4-72  )

( -4+64  -16+64   -28-16 )      

( -8+32   -12+80    -12+8)

( 32    88    -76 )

( 60    48     -44)        

( 24    68      -4 )

Therefore option c is correct.

!!