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3\left(\left(x^{3}\right)^{2}+6x^{3}x+9x^{2}\right)+1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x^{3}+3x\right)^{2}.
3\left(x^{6}+6x^{3}x+9x^{2}\right)+1
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
3\left(x^{6}+6x^{4}+9x^{2}\right)+1
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
3x^{6}+18x^{4}+27x^{2}+1
Use the distributive property to multiply 3 by x^{6}+6x^{4}+9x^{2}.
3\left(\left(x^{3}\right)^{2}+6x^{3}x+9x^{2}\right)+1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x^{3}+3x\right)^{2}.
3\left(x^{6}+6x^{3}x+9x^{2}\right)+1
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
3\left(x^{6}+6x^{4}+9x^{2}\right)+1
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
3x^{6}+18x^{4}+27x^{2}+1
Use the distributive property to multiply 3 by x^{6}+6x^{4}+9x^{2}.