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\left(x^{3}\right)^{3}-18\left(x^{3}\right)^{2}x+108x^{3}x^{2}-216x^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x^{3}-6x\right)^{3}.
x^{9}-18\left(x^{3}\right)^{2}x+108x^{3}x^{2}-216x^{3}
To raise a power to another power, multiply the exponents. Multiply 3 and 3 to get 9.
x^{9}-18x^{6}x+108x^{3}x^{2}-216x^{3}
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
x^{9}-18x^{7}+108x^{3}x^{2}-216x^{3}
To multiply powers of the same base, add their exponents. Add 6 and 1 to get 7.
x^{9}-18x^{7}+108x^{5}-216x^{3}
To multiply powers of the same base, add their exponents. Add 3 and 2 to get 5.
\left(x^{3}\right)^{3}-18\left(x^{3}\right)^{2}x+108x^{3}x^{2}-216x^{3}
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x^{3}-6x\right)^{3}.
x^{9}-18\left(x^{3}\right)^{2}x+108x^{3}x^{2}-216x^{3}
To raise a power to another power, multiply the exponents. Multiply 3 and 3 to get 9.
x^{9}-18x^{6}x+108x^{3}x^{2}-216x^{3}
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
x^{9}-18x^{7}+108x^{3}x^{2}-216x^{3}
To multiply powers of the same base, add their exponents. Add 6 and 1 to get 7.
x^{9}-18x^{7}+108x^{5}-216x^{3}
To multiply powers of the same base, add their exponents. Add 3 and 2 to get 5.