Let A be a 2 x 2 matrix. Show that some non-trivial linear combination of A^4, A^3, A^2, A. and I2 is equal 0. Generalize to n x n matrices. Note that I2 is 2 x 2 identity matrix.
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Expert's answer
2021-09-30T00:30:14-0400
Let A=I=[1001](2×2matrix)
∴A4=A3=A2=I=[1001]
Linear Combination:
aA4+bA3+cA2+dA+eI2=0
⇒(a+b+c+d+e)[1001]=0
∴a+b+c+d+e=0
Now, solving for (n×nmatrix):
Let A=In=⎣⎡100....0010000100000000000000.......0.......0.......0.......0001⎦⎤
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