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x in (-oo:+oo)
y = (56*x-(8*x^2))/49 // - (56*x-(8*x^2))/49
y-((56*x-(8*x^2))/49) = 0
y-((56*x-8*x^2)/49) = 0
(-1*(56*x-8*x^2))/49+y = 0
(-1*(56*x-8*x^2))/49+(49*y)/49 = 0
49*y-1*(56*x-8*x^2) = 0
8*x^2-56*x+49*y = 0
(8*x^2-56*x+49*y)/49 = 0
(8*x^2-56*x+49*y)/49 = 0 // * 49
8*x^2-56*x+49*y = 0
8*x^2-56*x+49*y = 0
DELTA = (-56)^2-(4*8*49*y)
DELTA = 3136-1568*y
3136-1568*y = 0
3136-1568*y = 0 // - 3136
-1568*y = -3136 // : -1568
y = -3136/(-1568)
y = 2
DELTA = 0 <=> t_3 = 2
x = 56/(2*8) i y = 2
x = 7/2 i y = 2
( x = ((3136-1568*y)^(1/2)+56)/(2*8) or x = (56-(3136-1568*y)^(1/2))/(2*8) ) i y > 2
( x = ((3136-1568*y)^(1/2)+56)/16 or x = (56-(3136-1568*y)^(1/2))/16 ) i y > 2
y-2 > 0
y-2 > 0 // + 2
y > 2
x in { 7/2, ((3136-1568*y)^(1/2)+56)/16, (56-(3136-1568*y)^(1/2))/16 }
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