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What is the domain of Square root of 19-x?
The choices given are a. All real numbers b. ( √19, infinity) c. ( -Infinity,19) d. (-infinity,19)union(19,infinity)
1 Answer
- ?Lv 63 years ago
Domain is where the function can't produce real numbers.
Rules regarding square roots is that you can't take a square root of a negative number.
If that doesn't make it immediately obvious where the domain sits, then try some test numbers.
19-19=0, so that's fine.
19-20=-1, so that won't work.
19-18 is 1, so it's even more fine than the first one.
It's anything 19 and smaller.