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F(x)=x-3
G(x)=x^3+4
H(x)=x^2+2x-5

(Foh)(x)

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F(x)=x-3\\H(x)=x^2+2x-5\\\\(F\circ H)(x)=(x^2+2x-5)-3=x^2+2x-5-3=x^2+2x-8

User Iliana
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