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Answer:
F(G(H(X)))=x4-28x3+294x2-1372x+2403
Explanation:
F(X)=X^4+2
G(X)=X−7
H(X)=X
F(X)=X^4+2 G(X)=X−7 H(X)=XF(G(H(X)))=x4-28x3+294x2-1372x+2403