2) Find the distance between the planes 2 x - y + 2 z = 5   a n d   5 x - 2 . 5 y + 5 z = 20 .
3 )   I f   f o r   a n y   2 × 2   s q u a r e   m a t r i x   A ,   A   ( a d j   A ) = 8 0 0 8 ,   t h e n   w r i t e   t h e   v a l u e   o f   A .

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Use  A(adjA) = det A In
         detA In= 8I2            (Taking 8 common)
         DetA= 8
       
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