Question 1209740
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Factor x^2 - 2x - y^2 + 2yz + 5z^2 as the product of two polynomials of degree 1.
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For this problem, @CPhill declare that the answer is 


        (x-y-z)(x+y-5z).



It is  NOT  SO.   I performed this multiplication,  and the result is different from the given polynomial.


Thus, the @CPhill answer is  INCORRECT,  and the problem remains to be unsolved.



In his post,  @CPhill writes that the product is  " close "  to the given polynomial.


But for problems on decomposition polynomials,  the notion/conception 
" close "  is not defined,  does not work and is  INACCEPTABLE.


So,  this solution by @CPhill is an attempt to deceive a reader, 
by overwhelming him with a bunch of words and formulas.


I noticed that  @CPhill often uses this method of deceiving,
so,  it looks like that it is just a common practice and a style for him.



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                Regarding the post by @CPhill . . . 



Keep in mind that @CPhill is a pseudonym for the Google artificial intelligence.


The artificial intelligence is like a baby now. It is in the experimental stage 
of development and can make mistakes and produce nonsense without any embarrassment.



                It has no feeling of shame - it is shameless.



This time, again,  it made an error.



Although the @CPhill' solutions are copy-paste  Google  AI solutions,  there is one essential difference.


Every time,  Google  AI  makes a note at the end of its solutions that  Google  AI  is experimental
and can make errors/mistakes.


All @CPhill' solutions are copy-paste of  Google  AI  solutions, with one difference:
@PChill never makes this notice and never says that his solutions are copy-past that of Google.
So,  he  NEVER  SAYS  TRUTH.


Every time,  @CPhill embarrassed to tell the truth.

But I am not embarrassing to tell the truth,  as it is my duty at this forum.



And the last my comment.


When you obtain such posts from @CPhill,  remember,  that  NOBODY  is responsible for their correctness, 
until the specialists and experts will check and confirm their correctness.


Without it,  their reliability is  ZERO and their creadability is  ZERO,  too.