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64m^{2}-81n^{2}
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64m^{2}-81n^{2}
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72mn+64m^{2}-81n^{2}-72nm
Apply the distributive property by multiplying each term of -8m+9n by each term of -9n-8m.
64m^{2}-81n^{2}
Combine 72mn and -72nm to get 0.
72mn+64m^{2}-81n^{2}-72nm
Apply the distributive property by multiplying each term of -8m+9n by each term of -9n-8m.
64m^{2}-81n^{2}
Combine 72mn and -72nm to get 0.
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