How do you find the domain of f(x)=5+√9−x?
1 Answer
Feb 12, 2015
You must ensure that the argument of your square root is always bigger or equal to zero (you cannot find a real solution of a negative square root).
Translated in maths means that you want:
So, you can choose 9 and numbers smaller than 9.
Graphically:
graph{5+sqrt(9-x) [-28.86, 28.88, -14.43, 14.43]}
