Question Number 100296 by bobhans last updated on 26/Jun/20

Given matrix A =  [((3     1     4)),((1     2      5)),((0     2     6)) ]  find:  adj(adj A) ?

Answered by bemath last updated on 26/Jun/20

adj(adj A) = ∣A∣^(n−1)  .A  A_(3×3)  ⇒∣A∣ = 3(12−10)−1(6−0)+4(2−0)  ∣A∣ = 6−6+8 = 8  ⇔adj(adj A) = (8)^(3−1)  .A  = 64  [((3     1     4)),((1     2     5)),((0     2     6)) ]