Help asap???

We have ..... h(x) = x² + 4

And I'm not sure, but I think this person might be wanting to evalute the composite function (h º h)(a)

This says to put "a" into f(x), and then put that result back into f(x) and evaluate again .................     (very odd, indeed !!!)

So we have......

h(a) = a² + 4   and "plugging" this result back into h(x), we have

h(a² + 4) = (a² + 4)² + 4  =   a⁴ + 8a² + 20

And that's (h º h)(a)      ......  (If that was the original intent !! )

Ok wow thats tough  I dont think thats possible. So no, this is not a helpful answer to your desperate plea. Sorry...

I am really guessing here - would someone like to verify please.

Plus I do not know how to use the notation properly.

h(x)=x^2+4 (h∘h)(a)

$$\\(x^2+4)^2+4 \\ $sub in a$\\ =(a^2+4)^2+4\\ =a^4+8a^2+16+4\\ =a^4+8a^2+20\\$$