Question

f(x) = sqrt(5 - x)
g(x) = sqrt(x^2 - 9)
(a) f + g =
b) f-g=

Answer 1

\[f[x]+g[x]=\sqrt{5-x}+\sqrt{-9+x^2} \] \[f[x]-g[x]=\sqrt{5-x}-\sqrt{-9+x^2} \]