Factories the following question

Dear Student,
25x4-x2-2x-125x4-(x2+2x+1)5x22-(x+1)2we know that a2-b2  = (a-b)(a+b)(5x2-x-1)(5x2+x+1)  

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25x4-(x2+2x+1)
(5x2)-(x+1)2
(5x2+x+1)(5x2-x-1)                      [using a2-b2=(a+b)(a-b)]
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