(X² - 8n + y²) + ( 2x² + 16x + 2y²) + (3x² - 20x + 5y²)
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Comparing the equation with the standard form ax2+2hxy+by2+2gx+2fy+c=0
a=2,h=−23,b=5,g=3,f=−23,c=5
Δ=abc+2fgh−af2−bg2−ch2
=(2)(5)(5)+2(−23)(3)(−23)−(2)(−23)2−(5)(3)2−(5)(−23)2
=50+227−29−45−4225
=−4169=0
Descriminant =h
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x²+2x²+3x²-8n+y²+2y²+5y²+16x-20x
=6x²-8n+8y²-4x
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