Factorise : 1-256x^4

Dear student
1-256x4=12-16x22=1-16x21+16x2   As a2-b2=(a-b)(a+b)
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1 - 256x4
= 12 - (16x)2                [  Identity : a2 - b2 = ( a+b) (a-b) ]
= (1 + 16x ) (1 - 16x )
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