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49m^{2}-64n^{2}
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49m^{2}-64n^{2}
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56mn+49m^{2}-64n^{2}-56nm
Apply the distributive property by multiplying each term of -7m+8n by each term of -8n-7m.
49m^{2}-64n^{2}
Combine 56mn and -56nm to get 0.
56mn+49m^{2}-64n^{2}-56nm
Apply the distributive property by multiplying each term of -7m+8n by each term of -8n-7m.
49m^{2}-64n^{2}
Combine 56mn and -56nm to get 0.
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