One of the factors of (25x2 - 1) + (1 + 5x)is:
(A) 5+x
(B) 5 - x (C) 5x - 1 (D) 10x
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Answer:
((5x)2-1)+(1+5x)
=(5x+1).(5x-1)+(5x+1)
=(5x+1).(5x-1+1)
=(5x+1).5x
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