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\left(-a\right)^{7}\times 5
To multiply powers of the same base, add their exponents. Add 3 and 4 to get 7.
\left(-1\right)^{7}a^{7}\times 5
Expand \left(-a\right)^{7}.
-a^{7}\times 5
Calculate -1 to the power of 7 and get -1.
-5a^{7}
Multiply -1 and 5 to get -5.
\left(-a\right)^{7}\times 5
To multiply powers of the same base, add their exponents. Add 3 and 4 to get 7.
\left(-1\right)^{7}a^{7}\times 5
Expand \left(-a\right)^{7}.
-a^{7}\times 5
Calculate -1 to the power of 7 and get -1.
-5a^{7}
Multiply -1 and 5 to get -5.