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Answer :

Really226go

Answer:

20

Step-by-step explanation:

f(x)= x - 1 and g(x)=x² + 5

(fog)(x)

=f(g(x))

=f(x^2+5)

=x^2+5-1

=x^2+4

(fog)(4)

=4^4+4

=20

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