Let $A = \begin{bmatrix} m & n \\ p & q \end{bmatrix}$,$d = |A| \neq 0$ and $|A - d(\operatorname{Adj} A)| = 0$. Then:

  • A
    $(1+d)^2 = (m+q)^2$
  • B
    $1+d^2 = (m+q)^2$
  • C
    $(1+d)^2 = m^2+q^2$
  • D
    $1+d^2 = m^2+q^2$

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