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Q.

The factors of the expression 27p³ –  1 216 –  9 2  p²+  1 4  p    is:
 


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a

(p – 1 6  ) (p – 1 6  ) (p – 1 6  )

b

(2p – 1 6  ) (2p – 1 6  ) (2p – 1 6  )

c

(3p – 1 6  ) (3p – 1 6  ) (3p – 1 6  )

d

(4p – 1 6  ) (4p – 1 6  ) (4p – 1 6  ) 

answer is C.

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Detailed Solution

Given: 27p³ –  1 216 –  9 2  p²+  1 4  p  
Now, let us rewrite the given expression as :
27 p 3 1 216 9 2 p 2 + 1 4 p= (3p) 3 ( 1 6 ) 3 3 (3p) 2 ( 1 6 )+3(3p) ( 1 6 ) 2  
Let us use the identity here:
(a – b)³ = a³ – b³ – 3a²b + 3ab²
= (3p 1 6 ) 3  
=(3p 1 6 )(3p 1 6 )(3p 1 6 )  
Hence, 27p³ –  1 216 –  9 2  p²+  1 4  p   = (3p – 1 6  ) (3p – 1 6  ) (3p – 1 6  )
Therefore, the correct option is 3.
 
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