Answer:
-x^2+21x+18/ x^3-x^3-16x-20
Explanation:
-x^2+21x+18/ (x-5)(x^2+4x+4)
= -x^2+21x+18/ x^3+4x^2+4x-5x^2-20x-20
= -x^2+21x+18/ x^3-x^2-16x-20
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