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D( x )
x^2-(5*x)+6 = 0
x^2-(5*x)+6 = 0
x^2-(5*x)+6 = 0
x^2-5*x+6 = 0
x^2-5*x+6 = 0
DELTA = (-5)^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)+5)/(1*2) or x = (5-1^(1/2))/(1*2)
x = 3 or x = 2
x in (-oo:2) U (2:3) U (3:+oo)
(2*x^2+3*x-54)/(x^2-(5*x)+6) = 0
(2*x^2+3*x-54)/(x^2-5*x+6) = 0
2*x^2+3*x-54 = 0
2*x^2+3*x-54 = 0
DELTA = 3^2-(-54*2*4)
DELTA = 441
DELTA > 0
x = (441^(1/2)-3)/(2*2) or x = (-441^(1/2)-3)/(2*2)
x = 9/2 or x = -6
(x+6)*(x-9/2) = 0
x^2-5*x+6 = 0
x^2-5*x+6 = 0
DELTA = (-5)^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)+5)/(1*2) or x = (5-1^(1/2))/(1*2)
x = 3 or x = 2
(x-2)*(x-3) = 0
((x+6)*(x-9/2))/((x-2)*(x-3)) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-9/2 )
x-9/2 = 0 // + 9/2
x = 9/2
x in { -6, 9/2 }
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