Question 1134759
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Under the transformation  g(x) = - f(x),

the plot of g(x) is obtained by the mirror reflection about x-axis.



      It is ALL you need to know about such transformations.



So, if the point (0,0) lies on the plot  (x,f(x)),  then this point lies on the plot (x,-f(x)), too.


And  if the point (-2,-1) lies on the plot  (x,f(x)),  then the point (-2,1) lies on the plot (x,-f(x)).
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Solved, answered and explained.



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Regarding the last line in your post


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    where the points are (0,0) and (-2,-1)
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please note that this fragment is incomplete sentence, not connected with the rest of the post.


It is not a completed phrase in English, so its meaning is DARK.


Avoid using such nonsensical passages in your post . . .