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2\left(\left(x^{3}\right)^{2}+6x^{3}+9\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x^{3}+3\right)^{2}.
2\left(x^{6}+6x^{3}+9\right)
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
2x^{6}+12x^{3}+18
Use the distributive property to multiply 2 by x^{6}+6x^{3}+9.
2\left(\left(x^{3}\right)^{2}+6x^{3}+9\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x^{3}+3\right)^{2}.
2\left(x^{6}+6x^{3}+9\right)
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
2x^{6}+12x^{3}+18
Use the distributive property to multiply 2 by x^{6}+6x^{3}+9.