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98m^{2}-128n^{2}
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98m^{2}-128n^{2}
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\left(-14m+16n\right)\left(-8n-7m\right)
Use the distributive property to multiply 2 by -7m+8n.
112mn+98m^{2}-128n^{2}-112nm
Apply the distributive property by multiplying each term of -14m+16n by each term of -8n-7m.
98m^{2}-128n^{2}
Combine 112mn and -112nm to get 0.
\left(-14m+16n\right)\left(-8n-7m\right)
Use the distributive property to multiply 2 by -7m+8n.
112mn+98m^{2}-128n^{2}-112nm
Apply the distributive property by multiplying each term of -14m+16n by each term of -8n-7m.
98m^{2}-128n^{2}
Combine 112mn and -112nm to get 0.
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