MatricesHard
Question
Matrix A = 
, if xyz = 50 and 8x + 4y + 3z = 30 then A (adj A) is equal to:-
, if xyz = 50 and 8x + 4y + 3z = 30 then A (adj A) is equal to:-Options
A.
B.
C.
D.
Solution
A.(Adj. A) = |A| I
|A| = xyz - 8x - 3(z - 8) + 2(2 - 2y)
= xyz - (8x + 3z + 4y) + 28
= 50 - 30 + 28 = 48
∴ A.(Adj A) = 48 I =
|A| = xyz - 8x - 3(z - 8) + 2(2 - 2y)
= xyz - (8x + 3z + 4y) + 28
= 50 - 30 + 28 = 48
∴ A.(Adj A) = 48 I =
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