Question

The domain of y=the square root of bx to the power of two -2 is undefined, which of the following best describes the value of 'b'?
a)b is less than or equal to 0
b)b<0
c)b=0
d)b is greater than or equal to 0

Answer 1

I can't quite parse your language. Do you mean

y = √(bx)^-2

or some other arrangement?

If that is what you meant, then b=0 will make the domain an empty set.

Answer 2

all good the bx but to the power of 2, not -2 then minus 2.