S=x1+x2=, -b/a, P=x1.x2=, c/a, x²+b/a x + c/a=0, x²-Sx+P=0, x1²+x2²=, S²-2P, Δ=?, b²-4ac, X1,X2=?, -b⁺⁻√Δ /2a.

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