Evaluate
8\left(64-7r\right)r^{2}
Expand
512r^{2}-56r^{3}
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8r^{3}-64r^{2}\left(r-8\right)
Multiply -1 and 64 to get -64.
8r^{3}-64r^{3}+512r^{2}
Use the distributive property to multiply -64r^{2} by r-8.
-56r^{3}+512r^{2}
Combine 8r^{3} and -64r^{3} to get -56r^{3}.
8r^{3}-64r^{2}\left(r-8\right)
Multiply -1 and 64 to get -64.
8r^{3}-64r^{3}+512r^{2}
Use the distributive property to multiply -64r^{2} by r-8.
-56r^{3}+512r^{2}
Combine 8r^{3} and -64r^{3} to get -56r^{3}.
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