If x=127+17 then x2-1x-x2-1=
1
2
3
4
Explanation for the correct answer:
To find the value of x2-1x-x2-1:
Given,
x=127+17
squaring on both sides
⇒x2=147+172⇒x2=147+17+2⇒4x2=4+5+17⇒4x2-4=5+17⇒4x2-1=367⇒x2-1=3628=97
Now, on substituting the above value in the equation x2-1x-x2-1
we get,
=97127+17-97=97827-37=378-627=62=3
Hence, the correct option is C.
If f=x1+x2+13(x1+x2)3+15(x1+x2)5+... to ∞ and g=x−23x3+15x5+17x7−29x9+..., then f=d×g. Find 4d.