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2\left(x+3\right)\left(x^{3}-6x^{2}+12x-8\right)+\left(x+3\right)^{2}\times 3\left(x-2\right)^{2}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x-2\right)^{3}.
\left(2x+6\right)\left(x^{3}-6x^{2}+12x-8\right)+\left(x+3\right)^{2}\times 3\left(x-2\right)^{2}
Use the distributive property to multiply 2 by x+3.
2x^{4}-6x^{3}-12x^{2}+56x-48+\left(x+3\right)^{2}\times 3\left(x-2\right)^{2}
Use the distributive property to multiply 2x+6 by x^{3}-6x^{2}+12x-8 and combine like terms.
2x^{4}-6x^{3}-12x^{2}+56x-48+\left(x^{2}+6x+9\right)\times 3\left(x-2\right)^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
2x^{4}-6x^{3}-12x^{2}+56x-48+\left(x^{2}+6x+9\right)\times 3\left(x^{2}-4x+4\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-2\right)^{2}.
2x^{4}-6x^{3}-12x^{2}+56x-48+\left(3x^{2}+18x+27\right)\left(x^{2}-4x+4\right)
Use the distributive property to multiply x^{2}+6x+9 by 3.
2x^{4}-6x^{3}-12x^{2}+56x-48+3x^{4}+6x^{3}-33x^{2}-36x+108
Use the distributive property to multiply 3x^{2}+18x+27 by x^{2}-4x+4 and combine like terms.
5x^{4}-6x^{3}-12x^{2}+56x-48+6x^{3}-33x^{2}-36x+108
Combine 2x^{4} and 3x^{4} to get 5x^{4}.
5x^{4}-12x^{2}+56x-48-33x^{2}-36x+108
Combine -6x^{3} and 6x^{3} to get 0.
5x^{4}-45x^{2}+56x-48-36x+108
Combine -12x^{2} and -33x^{2} to get -45x^{2}.
5x^{4}-45x^{2}+20x-48+108
Combine 56x and -36x to get 20x.
5x^{4}-45x^{2}+20x+60
Add -48 and 108 to get 60.
2\left(x+3\right)\left(x^{3}-6x^{2}+12x-8\right)+\left(x+3\right)^{2}\times 3\left(x-2\right)^{2}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x-2\right)^{3}.
\left(2x+6\right)\left(x^{3}-6x^{2}+12x-8\right)+\left(x+3\right)^{2}\times 3\left(x-2\right)^{2}
Use the distributive property to multiply 2 by x+3.
2x^{4}-6x^{3}-12x^{2}+56x-48+\left(x+3\right)^{2}\times 3\left(x-2\right)^{2}
Use the distributive property to multiply 2x+6 by x^{3}-6x^{2}+12x-8 and combine like terms.
2x^{4}-6x^{3}-12x^{2}+56x-48+\left(x^{2}+6x+9\right)\times 3\left(x-2\right)^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
2x^{4}-6x^{3}-12x^{2}+56x-48+\left(x^{2}+6x+9\right)\times 3\left(x^{2}-4x+4\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-2\right)^{2}.
2x^{4}-6x^{3}-12x^{2}+56x-48+\left(3x^{2}+18x+27\right)\left(x^{2}-4x+4\right)
Use the distributive property to multiply x^{2}+6x+9 by 3.
2x^{4}-6x^{3}-12x^{2}+56x-48+3x^{4}+6x^{3}-33x^{2}-36x+108
Use the distributive property to multiply 3x^{2}+18x+27 by x^{2}-4x+4 and combine like terms.
5x^{4}-6x^{3}-12x^{2}+56x-48+6x^{3}-33x^{2}-36x+108
Combine 2x^{4} and 3x^{4} to get 5x^{4}.
5x^{4}-12x^{2}+56x-48-33x^{2}-36x+108
Combine -6x^{3} and 6x^{3} to get 0.
5x^{4}-45x^{2}+56x-48-36x+108
Combine -12x^{2} and -33x^{2} to get -45x^{2}.
5x^{4}-45x^{2}+20x-48+108
Combine 56x and -36x to get 20x.
5x^{4}-45x^{2}+20x+60
Add -48 and 108 to get 60.