Answer:
3x^3−9x−18
Explanation:
Let's simplify step-by-step.
x3+2x3−9x−18
=x3+2x3+−9x+−18
Combine Like Terms:
=(x3+2x3)+(−9x)+(−18)
=3x3+−9x+−18
=3x^3−9x−18
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