this nice article might help. If not, come on back and indicate where you get stuck...
https://www.purplemath.com/modules/fcncomp4.htm
Express the function in the form f ∘ g ∘ h. (Use non-identity functions for f, g, and h.)
H(x) = 9 - (5)^x^2
{f(x), g(x), h(x)} =
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