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x in (-oo:+oo)
y = (1/5)*(x-1)*(x+9) // - (1/5)*(x-1)*(x+9)
y-((1/5)*(x-1)*(x+9)) = 0
(-1/5)*(x-1)*(x+9)+y = 0
y-1/5*(x-1)*(x+9) = 0
y-1/5*(x-1)*(x+9) = 0
y-1/5*x^2-8/5*x+9/5 = 0
y-1/5*x^2-8/5*x+9/5 = 0
y-1/5*x^2-8/5*x+9/5 = 0
DELTA = (-8/5)^2-(-1/5*4*(y+9/5))
DELTA = 4/5*(y+9/5)+64/25
4/5*(y+9/5)+64/25 = 0
(4/5*25*(y+9/5))/25+64/25 = 0
4/5*25*(y+9/5)+64 = 0
20*y+100 = 0
(20*y+100)/25 = 0
(20*y+100)/25 = 0 // * 25
20*y+100 = 0
20*y+100 = 0 // - 100
20*y = -100 // : 20
y = -100/20
y = -5
DELTA = 0 <=> t_3 = -5
x = 8/5/(-1/5*2) i y = -5
x = -4 i y = -5
( x = ((4/5*(y+9/5)+64/25)^(1/2)+8/5)/(-1/5*2) or x = (8/5-(4/5*(y+9/5)+64/25)^(1/2))/(-1/5*2) ) i y > -5
( x = -5/2*((4/5*(y+9/5)+64/25)^(1/2)+8/5) or x = -5/2*(8/5-(4/5*(y+9/5)+64/25)^(1/2)) ) i y > -5
y+5 > 0
y+5 > 0 // - 5
y > -5
x in { -4, -5/2*((4/5*(y+9/5)+64/25)^(1/2)+8/5), -5/2*(8/5-(4/5*(y+9/5)+64/25)^(1/2)) }
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