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2n^{4}+4n^{3}+2n^{2}-2n\left(n+1\right)\left(2n+1\right)+3n\left(n+1\right)
Use the distributive property to multiply 2n^{2} by n^{2}+2n+1.
2n^{4}+4n^{3}+2n^{2}-2n\left(n+1\right)\left(2n+1\right)+3n^{2}+3n
Use the distributive property to multiply 3n by n+1.
2n^{4}+4n^{3}+2n^{2}+\left(-2n^{2}-2n\right)\left(2n+1\right)+3n^{2}+3n
Use the distributive property to multiply -2n by n+1.
2n^{4}+4n^{3}+2n^{2}-4n^{3}-6n^{2}-2n+3n^{2}+3n
Use the distributive property to multiply -2n^{2}-2n by 2n+1 and combine like terms.
2n^{4}+2n^{2}-6n^{2}-2n+3n^{2}+3n
Combine 4n^{3} and -4n^{3} to get 0.
2n^{4}-4n^{2}-2n+3n^{2}+3n
Combine 2n^{2} and -6n^{2} to get -4n^{2}.
2n^{4}-n^{2}-2n+3n
Combine -4n^{2} and 3n^{2} to get -n^{2}.
2n^{4}-n^{2}+n
Combine -2n and 3n to get n.
2n^{4}+4n^{3}+2n^{2}-2n\left(n+1\right)\left(2n+1\right)+3n\left(n+1\right)
Use the distributive property to multiply 2n^{2} by n^{2}+2n+1.
2n^{4}+4n^{3}+2n^{2}-2n\left(n+1\right)\left(2n+1\right)+3n^{2}+3n
Use the distributive property to multiply 3n by n+1.
2n^{4}+4n^{3}+2n^{2}+\left(-2n^{2}-2n\right)\left(2n+1\right)+3n^{2}+3n
Use the distributive property to multiply -2n by n+1.
2n^{4}+4n^{3}+2n^{2}-4n^{3}-6n^{2}-2n+3n^{2}+3n
Use the distributive property to multiply -2n^{2}-2n by 2n+1 and combine like terms.
2n^{4}+2n^{2}-6n^{2}-2n+3n^{2}+3n
Combine 4n^{3} and -4n^{3} to get 0.
2n^{4}-4n^{2}-2n+3n^{2}+3n
Combine 2n^{2} and -6n^{2} to get -4n^{2}.
2n^{4}-n^{2}-2n+3n
Combine -4n^{2} and 3n^{2} to get -n^{2}.
2n^{4}-n^{2}+n
Combine -2n and 3n to get n.