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\left(-a^{3}\right)\left(-a\right)^{5}
To multiply powers of the same base, add their exponents. Add 2 and 3 to get 5.
-a^{3}\left(-1\right)^{5}a^{5}
Expand \left(-a\right)^{5}.
-a^{3}\left(-1\right)a^{5}
Calculate -1 to the power of 5 and get -1.
a^{3}a^{5}
Multiply -1 and -1 to get 1.
a^{8}
To multiply powers of the same base, add their exponents. Add 3 and 5 to get 8.
\left(-a^{3}\right)\left(-a\right)^{5}
To multiply powers of the same base, add their exponents. Add 2 and 3 to get 5.
-a^{3}\left(-1\right)^{5}a^{5}
Expand \left(-a\right)^{5}.
-a^{3}\left(-1\right)a^{5}
Calculate -1 to the power of 5 and get -1.
a^{3}a^{5}
Multiply -1 and -1 to get 1.
a^{8}
To multiply powers of the same base, add their exponents. Add 3 and 5 to get 8.