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D( x )
2*x^2-(14*x)+20 = 0
2*x^2-(14*x)+20 = 0
2*x^2-(14*x)+20 = 0
2*x^2-14*x+20 = 0
2*x^2-14*x+20 = 0
DELTA = (-14)^2-(2*4*20)
DELTA = 36
DELTA > 0
x = (36^(1/2)+14)/(2*2) or x = (14-36^(1/2))/(2*2)
x = 5 or x = 2
x in (-oo:2) U (2:5) U (5:+oo)
(5-(3*x))/(2*x^2-(14*x)+20) = 0
(5-3*x)/(2*x^2-14*x+20) = 0
2*x^2-14*x+20 = 0
2*(x^2-7*x+10) = 0
x^2-7*x+10 = 0
DELTA = (-7)^2-(1*4*10)
DELTA = 9
DELTA > 0
x = (9^(1/2)+7)/(1*2) or x = (7-9^(1/2))/(1*2)
x = 5 or x = 2
2*(x-2)*(x-5) = 0
(5-3*x)/(2*(x-2)*(x-5)) = 0
5-3*x = 0 // - 5
-3*x = -5 // : -3
x = -5/(-3)
x = 5/3
x = 5/3
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