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Which description compares the domains of Function A and Function B correctly?

 

Function A: f(x)=√(−x)

Function B:

A.) The domain of both functions is the set of real numbers greater than or equal to 0.

 

B.) The domain of Function A is the set of real numbers greater than 0.
The domain of Function B is the set of real numbers less than or equal to 0.

 

C.) The domain of both functions is the set of real numbers less than or equal to 0.

 

D.) The domain of Function A is the set of real numbers greater than 0.
The domain of Function B is the set of real numbers greater than or equal to 0.

 Feb 28, 2019
 #1
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f(x)  =  sqrt (-x)

Because the quantity under the root must be greater or equal to 0....then...

The domain of A is (-inf, 0 ]

The domain of B =  g(x)  is exactly the same

 

So

 

C.) The domain of both functions is the set of real numbers less than or equal to 0.

 

 

cool cool cool

 Feb 28, 2019

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