Question: Given > 0 , we need > 0 such that if 0 < | x 3 | < , then x 2 + x 1

Given
>0,
we need
>0
such that if
0<|x 3|<,
then
x2+ x 12x 3
7
<
(x +4)(x 3)x 3
7
<
|x +47|<[x 3]
0<|x 3|<.
So choose =---Select---47x -7.
Then 0<|x 3|<
0<|x 3|<
0<|x +47|<
(x +4)(x 3)x 3
7
<[x 3]
x2+ x 12x 3
7
<.
By the definition of a limit,
limx 3
x2+ x 12x 3
=.

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