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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` isA. `0`B. `2`C. `5`D. `8` |
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Answer» Correct Answer - C 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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