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Thread: please help me

  1. #1
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    please help me

    Let :
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  2. #2
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    Quote Originally Posted by flower3 View Post
    Let :
    I find it difficult to understand why this question is posted in an advanced forum.
    I will let you work out this fact: $\displaystyle \left( {\exists N} \right)\left[ {n \geqslant N\, \Rightarrow \,\left| {x_n + 3} \right| < 7} \right]$.
    Note that: $\displaystyle \left| {x_n ^2 - 9} \right| = \left| {x_n + 3} \right|\left| {x_n - 3} \right|$
    It follows from that fact.
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