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AP EAMCET20228 Jul 2022Morning ShiftMathematicsMatricesActual

If A= [ array ccc 1 & -3 & 2 -2 & 1 & 3 3 & 2 & -1 array ] then A^2 Adj A=

Options

  1. A21 ~A
  2. B-42 ~A
  3. C7 ~A -1
  4. D14( Adj A)

Correct answer

B. -42 ~A

Step-by-step solution

| A | | array ccc 1 & -3 & 2 -2 & 1 & 3 3 & 2 & -1 array | aligned & =1-(-1-6)+3(2-9)+2(-4-3) & =-7-21-14=-42 aligned Now, A^2 adj A=A A adj A=A|A|=-42

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