If A = (aij) = M3 (K) for a field K then the characteristic polynomial of A has the form p₁(x) = - det(A) + C(A)x − Tr(A)x² + x³ where the coefficient of a can be computed as C(A) = a11@22 + a22a33 + a11933 a12a21a13a31 - a23a32 (a) is it necessarily true that if A is invertible then C(A¯¹) = C(A)? (b) is it necessarily true that if det (A) = Tr(A) = 0 then A³ = -C(A)A?
If A = (aij) = M3 (K) for a field K then the characteristic polynomial of A has the form p₁(x) = - det(A) + C(A)x − Tr(A)x² + x³ where the coefficient of a can be computed as C(A) = a11@22 + a22a33 + a11933 a12a21a13a31 - a23a32 (a) is it necessarily true that if A is invertible then C(A¯¹) = C(A)? (b) is it necessarily true that if det (A) = Tr(A) = 0 then A³ = -C(A)A?
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter8: Polynomials
Section8.3: Factorization In F [x]
Problem 13E
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![If A = (aij) = M3 (K) for a field K then the characteristic polynomial of A has the form p₁(x) = - det(A) + C(A)x − Tr(A)x² + x³ where the coefficient
of a can be computed as
C(A) = a11@22 + a22a33 + a11933 a12a21a13a31 - a23a32
(a) is it necessarily true that if A is invertible then C(A¯¹) = C(A)?
(b) is it necessarily true that if det (A) = Tr(A) = 0 then A³ = -C(A)A?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0de9773e-39c1-4df6-a7d6-864501c7f552%2Fd7957d8c-dd04-4b24-a5e7-146a282a9df6%2F35j46wj_processed.png&w=3840&q=75)
Transcribed Image Text:If A = (aij) = M3 (K) for a field K then the characteristic polynomial of A has the form p₁(x) = - det(A) + C(A)x − Tr(A)x² + x³ where the coefficient
of a can be computed as
C(A) = a11@22 + a22a33 + a11933 a12a21a13a31 - a23a32
(a) is it necessarily true that if A is invertible then C(A¯¹) = C(A)?
(b) is it necessarily true that if det (A) = Tr(A) = 0 then A³ = -C(A)A?
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