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q=12/3=4
2q+3p=23
2.4+3p=23
8+3p=23
3p=23-8
3p=15
p=15/3=5
r=2p
r=2.5
r=10
2px² + 2qxy + 3pxy + 3qy² = r² + 23xy + 12y²
3qy² = 12y²
3q = 12
q = 4
2qxy + 3pxy = 23xy
2(4)xy + 3pxy = 23xy
8xy + 3pxy = 23xy
3pxy = 15xy
3p = 15
p = 5
2px² = r²
2(5)x² = r²
10x² = r²
r² = 10x²
r = √10x²
r = x√10