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27\left(x^{2}\right)^{3}-162\left(x^{2}\right)^{2}+324x^{2}-216
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(3x^{2}-6\right)^{3}.
27x^{6}-162\left(x^{2}\right)^{2}+324x^{2}-216
To raise a power to another power, multiply the exponents. Multiply 2 and 3 to get 6.
27x^{6}-162x^{4}+324x^{2}-216
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
27\left(x^{2}\right)^{3}-162\left(x^{2}\right)^{2}+324x^{2}-216
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(3x^{2}-6\right)^{3}.
27x^{6}-162\left(x^{2}\right)^{2}+324x^{2}-216
To raise a power to another power, multiply the exponents. Multiply 2 and 3 to get 6.
27x^{6}-162x^{4}+324x^{2}-216
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.