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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