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4\left(x^{3}\right)^{2}-12x^{3}x+9x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x^{3}-3x\right)^{2}.
4x^{6}-12x^{3}x+9x^{2}
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
4x^{6}-12x^{4}+9x^{2}
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
4\left(x^{3}\right)^{2}-12x^{3}x+9x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x^{3}-3x\right)^{2}.
4x^{6}-12x^{3}x+9x^{2}
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
4x^{6}-12x^{4}+9x^{2}
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.