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y = 1*x^2+(-5/2)*x-3/2;1;-5/2;-3/2
-(((-5/2)^2-(1*4*(-3/2)))/(1*4))
-((-5/2)/(1*2))
1*0^2+0*(-5/2)-(3/2)
0*(1/2)-3 = 0
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