1.

If M is a 2xx2 matrix such that [(1),(-1)]=[(-1),(2)] and M^(2)[(1),(-1)]=[(1),(0)] then sum of elements of M is

Answer»

`0`
`2`
`5`
`8`

SOLUTION :Let`M=[[a,b],[c,d]]`
Now, `M [[1],[-1]] = [[-1],[2]] & M^(2) [[1],[-1]]=[[1],[0]]`
`impliesa=-1,b=0, c=4,d=2`
`THEREFORE (a+b+c+d) = 5`


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