Help please don't understand it

Question

If f(x)=x^3+4,g(x)=x−5,h(x)=√x, then (f∘g∘h)(x)=    .



You do not need to simplify your answer

Answer 1

f(x)=x^3+4, g(x)=x-5, h(x)=sqrx

f(g(h(x)) =f(g(sqrx)) =f(sqrx-5) =(sqrx-5)^3 +4

=(sqrx-5)(x-10sqrx+25) +4

=xsqrx- 10x +25sqrx-5x+50sqrx-125 +4

= xsqrx +75sqrx -15x-121

=(x+75)sqrx -15x -121