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Question

One of the factors of (25x2 − 1) + (1 + 5x)2 is


A

5 + x

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B

5 - x

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C

5x - 1

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D

10x

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Solution

The correct option is 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 factors of given polynomial is 10x.


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