£(x - 50) =60,£(y-20) = -20,£(x -50)^2 = 450,£(y - 20)^2 = 200,£(x - 50)(y - 20) = -100
Solution:
£(x - 50) =60,
"\\Rightarrow x=60+50=110"
£(y-20) = -20,
"\\Rightarrow y=-20+20=0"
£(x -50)^2 = 450,
"\\Rightarrow x=\\pm\\sqrt{450}+50=\\pm15\\sqrt{2}+50"
£(y - 20)^2 = 200,
"\\Rightarrow y=\\pm\\sqrt{200}+20=\\pm10\\sqrt{2}+20"
£(x - 50)(y - 20) = -100
"\\Rightarrow xy-50y-20y+1000=-100\n\\\\\\Rightarrow xy-50y-20y=-1100"
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