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y = (-(1/4))*x^2+(-(3/2))*x+3/4;-(1/4);-(3/2);3/4
-(((-(3/2))^2-(4*(-(1/4))*(3/4)))/(4*(-(1/4))))
-((-(3/2))/(2*(-(1/4))))
(-(1/4))*0^2+0*(-(3/2))+3/4
y = 0.4*x-1*x^2+0.8;-1;0.4;0.8
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