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81-36x^{5}+4\left(x^{5}\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9-2x^{5}\right)^{2}.
81-36x^{5}+4x^{10}
To raise a power to another power, multiply the exponents. Multiply 5 and 2 to get 10.
81-36x^{5}+4\left(x^{5}\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9-2x^{5}\right)^{2}.
81-36x^{5}+4x^{10}
To raise a power to another power, multiply the exponents. Multiply 5 and 2 to get 10.