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Answer :

Answer:

   -4x^2 +21x -35

Step-by-step explanation:

The difference of the two polynomials is ...

  (x -10) -(2x -5)^2

  = (x -10) -(4x^2 -20x +25)

  = x -10 -4x^2 +20x -25

  = -4x^2 +21x -35