- Home
- Standard 9
- Mathematics
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