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D( x )
2*x^2-(5*x)-3 = 0
2*x^2-(5*x)-3 = 0
2*x^2-(5*x)-3 = 0
2*x^2-5*x-3 = 0
2*x^2-5*x-3 = 0
DELTA = (-5)^2-(-3*2*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(2*2) or x = (5-49^(1/2))/(2*2)
x = 3 or x = -1/2
x in (-oo:-1/2) U (-1/2:3) U (3:+oo)
(x-3)/(2*x^2-(5*x)-3) = 0
(x-3)/(2*x^2-5*x-3) = 0
2*x^2-5*x-3 = 0
2*x^2-5*x-3 = 0
DELTA = (-5)^2-(-3*2*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(2*2) or x = (5-49^(1/2))/(2*2)
x = 3 or x = -1/2
(x+1/2)*(x-3) = 0
(x-3)/((x+1/2)*(x-3)) = 0
x-3 = 0 // + 3
x = 3
x in { 3}
x belongs to the empty set
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