Question 972152
x^2+4  
Domain, all reals; x can be anything.
Range y≥4

f(0)=4


sqrt(7-x)
x must be ≤7   (-infinity,7]
y≥0
g(0)=sqrt(7)

{{{graph(300,300,-10,10,-10,10,x^2+4,sqrt(7-x))}}}