Answer
See below.
Work Step by Step
According to the exercise:
$x_1=h(x_0)=h(-1)=(-1)^2-6=-5$
$x_2=h(x_1)=h(-5)=(-5)^2-6=19$
$x_3=h(x_2)=h(19)=19^2-6=355$
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