2. Polynomials
medium

$\left(25 x^{2}-1\right)+(1+5 x)^{2}$ के गुणनखंडों में से एक है

A

$5+x$

B

$5-x$

C

$10x$

D

$5x-1$

Solution

$\left(25 x^{2}-1\right)+(1+5 x)^{2}=(5 x)^{2}-1^{2}+(5 x+1)^{2}$

$=(5 x-1)(5 x-1)+(5 x+1)^{2}=(5 x+1)(5 x-1+5 x+1)$

$=(5 x+1)(10 x)=10 x(5 x+1)$

Hence, one of the factors of $\left(25 x^{2}-1\right)+(1+5 x)^{2}$ is $10 x$.

Therefore, $(c)$ is the correct answer.

Standard 9
Mathematics

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