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\left(-3\right)^{2}a^{2}-a^{4}+\left(-2a^{2}\right)^{3}
Expand \left(-3a\right)^{2}.
9a^{2}-a^{4}+\left(-2a^{2}\right)^{3}
Calculate -3 to the power of 2 and get 9.
9a^{2}-a^{4}+\left(-2\right)^{3}\left(a^{2}\right)^{3}
Expand \left(-2a^{2}\right)^{3}.
9a^{2}-a^{4}+\left(-2\right)^{3}a^{6}
To raise a power to another power, multiply the exponents. Multiply 2 and 3 to get 6.
9a^{2}-a^{4}-8a^{6}
Calculate -2 to the power of 3 and get -8.
\left(-3\right)^{2}a^{2}-a^{4}+\left(-2a^{2}\right)^{3}
Expand \left(-3a\right)^{2}.
9a^{2}-a^{4}+\left(-2a^{2}\right)^{3}
Calculate -3 to the power of 2 and get 9.
9a^{2}-a^{4}+\left(-2\right)^{3}\left(a^{2}\right)^{3}
Expand \left(-2a^{2}\right)^{3}.
9a^{2}-a^{4}+\left(-2\right)^{3}a^{6}
To raise a power to another power, multiply the exponents. Multiply 2 and 3 to get 6.
9a^{2}-a^{4}-8a^{6}
Calculate -2 to the power of 3 and get -8.