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y = (-1/3)*x^2-2*x-3;-1/3;-2;-3
-(((-2)^2-(-3*4*(-1/3)))/(4*(-1/3)))
-(-2/(2*(-1/3)))
(-1/3)*0^2-(0*2)-3
y = (-1/3)*x^2-2*x-3;-1/3;-2;-3
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