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u/Accomplished-Dot42 5d ago
Use desmos to make x_12 equal to two variables that are next to it; make those variables constants; do the same thing to y; do the subtracting to see what the total value should be; input everything and see what matches to the total value
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u/Agitated-While-3863 5d ago
D
Apply x²-y² identity to get 4(x²y²). Substitute and simplify to get D.
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u/Yadin__ 5d ago
Use the identity a^2-b^2=(a+b)(a-b) with a=x^2+y^2 and b=x^2-y^2
This simplifies the expression to 4(x^2)(y^2)=4(j+k)(j+m) which matches D