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169y^{2}-64x^{2}
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169y^{2}-64x^{2}
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-64x^{2}+104xy-104yx+169y^{2}
Apply the distributive property by multiplying each term of -8x-13y by each term of 8x-13y.
-64x^{2}+169y^{2}
Combine 104xy and -104yx to get 0.
-64x^{2}+104xy-104yx+169y^{2}
Apply the distributive property by multiplying each term of -8x-13y by each term of 8x-13y.
-64x^{2}+169y^{2}
Combine 104xy and -104yx to get 0.
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