Question: Given > 0 , we need > 0 such that if 0 < | x 3 | < , then x 2 + x 1
Given
we need
such that if
x
then
x x x
x x x
x x
x
So choose Selectx
Then x
x
x
x x x
x
x x x
By the definition of a limit
limx
x x x
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