Posted by alli on .
find the domain of the composite function f of g. f(x)=x^2+9;g(x)=sqrtx7
please show work

alg 
Steve,
f(g) = g^2+9
domain of f is all reals, so as long as g is real, so is f.
domain of g is all reals >= 7
so domain of f(g) is all reals >= 7