How to solve the problem

asked Sep 8, 2019 114k views

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$f(x)=x^2+1\\\\f(4)\to\text{put x = 4 to the equation of the function f}\\\\f(4)=4^2+1=16+1=17\\\\\ [f(4)]^2=17^2=289\\\\Answer:\ \boxed{289}$

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