Can anybody please tell me the answer of this question with its solution as well . The question is taken from maths(determinants)NDA 2015-Ist Paper
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Answer:
7I
Step-by-step explanation:
determinant=2×5-7×1=3
det(A-kI)=0
10-7k+k^2-7=0
k^2-7k+3=0, dividing by k
k+3/k=7.
replacing k by A.
A + 3 A^-1=7I
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