The domain of the function f(x) = √1-x what is ln x?

Answer 1

Is a pair of () needed in the sq rt?

Answer 2

Assuming the top of the radical extends to over x, we have a sideways inverted parabola slightly translated:

y^2 = 1 - x

x = 1 - y^2

ln x = ln ( 1 - y^2 ) = ln (1+y) + ln (1-y)