(3x^3+4x^2)+(3x^3-4x^2-9x)
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Answer:
9x^6-43x^4-36x^3
Step-by-step explanation:
(3x^3+4x^2)+(3x^3-4x^2-9x) =9x^6-12x^5-27x^4+12x^5-16x^4-36x^3 =9x^6-43x^4-36x^3
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