1.

One of the factors of `(25 x^(2)-1) +(1+5x)^(2)` isA. `5+x`B. `5-x`C. `5x-1`D. `10x`

Answer» Correct Answer - D
Now ,`(25x^(2)-1)=(1+5x)^(2)`
`=25x^(2)-1+1+25x^(2)+10x " " ["using identity , " (a+b)^(2)=a^(2)+b^(2)+2ab]`
`=50 x^(2)+10x=10x(5x+1)`
Hence ,one of the factor of given polynomial is 10x .


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