Question
If A = and A^{2} – 4A – n I = 0, then n is equal to


 – 3
 3
The correct answer is: – 3
= 0
4 + – 4 – 1 = 0
– 4 + 3 = 0
A^{2} – 4A + 3I = 0
–n = 3 & n = – 3
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