Find 4B (matrix)

Question

Find 4B. 

⌈2  -4⌉ = B

⌊5  -1⌋

 

⌈-8  -16⌉=a

⌊-20  -4⌋

 

⌈8  -16⌉=b

⌊20  -4⌋

 

⌈2   -4⌉=c

⌊20 -4⌋

 

⌈8  -16⌉=d

⌊5   -1 ⌋

Answer 1

When multiplying a matrix by a constant, just multiply each element in that matrix by that constant.

 

So if B =

⌈2 -4⌉ 
⌊5 -1⌋

 

Then 4B =

⌈8 -16⌉
⌊20 -4⌋

The answer is b.