algebra
posted by Shaq .
how to solve equations like SQRT(x6)/SQRT(4x) for their domain

The domain will be all real numbers except:
where the denominator is zero
one of the radicands is negative
so,
x6 >= 0, or x >= 6
4x >= 0, or x <= 4
exclude x=4
we want all x satisfying all of the above. I don't see any.
x >= 6 means 4x < 0
x < 4 means x6 < 0
so, nowhere is there a valid sqrt possible