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3a^{8}-\left(-a^{4}\right)^{2}
To multiply powers of the same base, add their exponents. Add 3 and 5 to get 8.
3a^{8}-\left(a^{4}\right)^{2}
Calculate -a^{4} to the power of 2 and get \left(a^{4}\right)^{2}.
3a^{8}-a^{8}
To raise a power to another power, multiply the exponents. Multiply 4 and 2 to get 8.
2a^{8}
Combine 3a^{8} and -a^{8} to get 2a^{8}.
3a^{8}-\left(-a^{4}\right)^{2}
To multiply powers of the same base, add their exponents. Add 3 and 5 to get 8.
3a^{8}-\left(a^{4}\right)^{2}
Calculate -a^{4} to the power of 2 and get \left(a^{4}\right)^{2}.
3a^{8}-a^{8}
To raise a power to another power, multiply the exponents. Multiply 4 and 2 to get 8.
2a^{8}
Combine 3a^{8} and -a^{8} to get 2a^{8}.