Is it D?
how ur last condition of taking range implies that
their will be one root????
I have reached to the linear equation in 't' by simplifying the original equation. So, I found the roots of the initial equation only, but in terms of 't'. In the final step I just put the condition on the roots.
as t is parabola nd if u will rhs side is hyperbola type after more simplification how u can prove their will be one root in this interval
u have taken full interval of range their may be chance when it will cut graph at no point or may be in more point too..
@Hari_Shankar sir any shortcut approch u find???
If you don't get it, you can just put x(x+1) in place of 't'. then you'll get a quadratic in 'x' and then you can apply D>=0 to get interval of 'a'. Which will be enough to show atleast 1 real root.
See Question no. (10)
thanks jagdish sir...