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Cayley-Hamilton Theorem states that a square matrix satisfies its own characteristic equation. Consider a matrix below. Find A8:
  • a)
    225A - 254J
  • b)
    -255A -254 J
  • c)
    15A - 14J
  • d)
    255A 254J
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Cayley-Hamilton Theorem states that a square matrix satisfies its own ...
Characteristic equation,  - λ (3-λ) 2 = 0
                        λ- 3λ 2 = 0
            So,                A- 3A 2I = 0           .....(1)
            ⇒             New, A= A2 x A2
From equation (1), 
                           A =  (3A – 2I) × (3A – 2I)
                                = 9A2 – 12A 4I
                                = 9{3A – 2I} – 12A 4I
                                = 27A – 18I – 12A 4I
                           A4  = 15 A – 14I
            Now,        A8  = A4 × A4
                                 = (15A – 14I) × (15A – 14I)
                                 = 225 A2 – 420 A 196I
                                 = 225 {3A – 2I} – 420 A 196I
                           A8  = 255 A – 254 I
 
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Cayley-Hamilton Theorem states that a square matrix satisfies its own characteristic equation. Consider a matrix below. Find A8:a)225A - 254Jb)-255A -254 Jc)15A - 14Jd)255A 254JCorrect answer is option 'A'. Can you explain this answer?
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