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x in (-oo:+oo)
y = (-1/9)*x^2+5*x+3 // - (-1/9)*x^2+5*x+3
y-((-1/9)*x^2)-(5*x)-3 = 0
(1/9)*x^2-5*x+y-3 = 0
1/9*x^2-5*x+y-3 = 0
DELTA = (-5)^2-(1/9*4*(y-3))
DELTA = 25-4/9*(y-3)
25-4/9*(y-3) = 0
25-4/9*(y-3) = 0
79/3-4/9*y = 0
79/3-4/9*y = 0
79/3-4/9*y = 0 // - 79/3
-4/9*y = -79/3 // : -4/9
y = -79/3/(-4/9)
y = 237/4
DELTA = 0 <=> t_1 = 237/4
x = 5/(1/9*2) i y = 237/4
x = 45/2 i y = 237/4
( x = ((25-4/9*(y-3))^(1/2)+5)/(1/9*2) or x = (5-(25-4/9*(y-3))^(1/2))/(1/9*2) ) i y > 237/4
( x = 9/2*((25-4/9*(y-3))^(1/2)+5) or x = 9/2*(5-(25-4/9*(y-3))^(1/2)) ) i y > 237/4
y-237/4 > 0
y-237/4 > 0 // + 237/4
y > 237/4
x in { 45/2, 9/2*((25-4/9*(y-3))^(1/2)+5), 9/2*(5-(25-4/9*(y-3))^(1/2)) }
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