1.

One of the factors of (25x2 – 1) + (1 + 5x)2 is (A) 5 + x (B) 5 – x (C) 5x – 1 (D) 10x

Answer»

(d) 10x

Now, (25x2 -1) + (1 + 5x)2

= 25x2 -1 + 1 + 25x2 + 10x [using identity, (a + b)2 = a2 + b2 + 2ab]

= 50x2 + 10x 

= 10x (5x+ 1)

Hence, one of the factor of given polynomial is 10x.



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