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2^{3}\left(a^{3}\right)^{3}b^{3}\left(-2\right)b^{4}
Expand \left(2a^{3}b\right)^{3}.
2^{3}a^{9}b^{3}\left(-2\right)b^{4}
To raise a power to another power, multiply the exponents. Multiply 3 and 3 to get 9.
8a^{9}b^{3}\left(-2\right)b^{4}
Calculate 2 to the power of 3 and get 8.
-16a^{9}b^{3}b^{4}
Multiply 8 and -2 to get -16.
-16a^{9}b^{7}
To multiply powers of the same base, add their exponents. Add 3 and 4 to get 7.
2^{3}\left(a^{3}\right)^{3}b^{3}\left(-2\right)b^{4}
Expand \left(2a^{3}b\right)^{3}.
2^{3}a^{9}b^{3}\left(-2\right)b^{4}
To raise a power to another power, multiply the exponents. Multiply 3 and 3 to get 9.
8a^{9}b^{3}\left(-2\right)b^{4}
Calculate 2 to the power of 3 and get 8.
-16a^{9}b^{3}b^{4}
Multiply 8 and -2 to get -16.
-16a^{9}b^{7}
To multiply powers of the same base, add their exponents. Add 3 and 4 to get 7.