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Solution
Find (x^3-12*x^2-42)-(x^2+x-3)

Solution:
Your problem -> (x^3-12*x^2-42)-(x^2+x-3)

(x3-12x2-42) - (x2+x-3)
= x3 - 12x2 - 42 - x2 - x + 3
= x3 - 12x2 - x2 - x - 42 + 3
= x3 - 13x2 - x - 39

OR
  x^3 - 12x^2 + 0x - 42 -  −x^2 + −x - +3  x^3 - 13x^2 - x - 39

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