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\left(-a\right)^{7}\left(-a\right)
To multiply powers of the same base, add their exponents. Add 4 and 3 to get 7.
\left(-a\right)^{8}
To multiply powers of the same base, add their exponents. Add 7 and 1 to get 8.
\left(-1\right)^{8}a^{8}
Expand \left(-a\right)^{8}.
1a^{8}
Calculate -1 to the power of 8 and get 1.
a^{8}
For any term t, t\times 1=t and 1t=t.
\left(-a\right)^{7}\left(-a\right)
To multiply powers of the same base, add their exponents. Add 4 and 3 to get 7.
\left(-a\right)^{8}
To multiply powers of the same base, add their exponents. Add 7 and 1 to get 8.
\left(-1\right)^{8}a^{8}
Expand \left(-a\right)^{8}.
1a^{8}
Calculate -1 to the power of 8 and get 1.
a^{8}
For any term t, t\times 1=t and 1t=t.