There are 2 roots. Why do you ask this
because our book says this, for example when x^0.5-6-x
we get x=4,9
they say root x=3,2
and since 6-9=-3 they say that 9 does not satisfy the original equation as they are not considering root x=-3, as they say that root x=>0, so i am asking why is root x=>0?