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Absolute value of sum of roots of the eq...

Absolute value of sum of roots of the equation `{:|(x+2,2x+3,3x+4), (2x+3, 3x+4, 4x+5), (3x+5, 5x+8, 10 x+17)|:}=0` is _______.

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  18. If u=a x^2+2b x y+c y^2,\ y^(prime)=a^('2)+2b^(prime)x y+c^(prime)y^2,...

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  19. If the system of linear equations x+a y+a z=0,\ x+b y+b z=0,\ x+c y...

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