Answer
See below.
Work Step by Step
According to the exercise:
$x_1=f(x_0)=f(-1)=2(-1)^2+1=3$
$x_2=f(x_1)=f(5)=2(3)^2+1=19$
$x_3=f(x_2)=f(19)=2(19)^2+1=723$
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