Question

Solve the matrix equations:

`[1  2   1] [[1,2,0],[2,0,1],[1,0 ,2]][[0],[2],[x]]=0`

Answer 1

[1   2    1] `[[1,2,0],[2,0,1],[1,0,2]] [[0],[2],[x]]=0`

⇒[1+4+1       2+0+0      0+2+2] `[[0],[2],[x]]=0` 

⇒[6   2    4]   `[[0],[2],[x]]=0` 

⇒[0+4+4x]=0

⇒4+4x=0

⇒4x=−4

∴ `x=(-4)/4 =-1`