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D( x )
6*x^2-x-1 = 0
6*x^2-x-1 = 0
6*x^2-x-1 = 0
6*x^2-x-1 = 0
DELTA = (-1)^2-(-1*4*6)
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(2*6) or x = (1-25^(1/2))/(2*6)
x = 1/2 or x = -1/3
x in (-oo:-1/3) U (-1/3:1/2) U (1/2:+oo)
(2*x^2-(13*x)+6)/(6*x^2-x-1) = 0
(2*x^2-13*x+6)/(6*x^2-x-1) = 0
2*x^2-13*x+6 = 0
2*x^2-13*x+6 = 0
DELTA = (-13)^2-(2*4*6)
DELTA = 121
DELTA > 0
x = (121^(1/2)+13)/(2*2) or x = (13-121^(1/2))/(2*2)
x = 6 or x = 1/2
(x-1/2)*(x-6) = 0
6*x^2-x-1 = 0
6*x^2-x-1 = 0
DELTA = (-1)^2-(-1*4*6)
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(2*6) or x = (1-25^(1/2))/(2*6)
x = 1/2 or x = -1/3
(x+1/3)*(x-1/2) = 0
((x-1/2)*(x-6))/((x+1/3)*(x-1/2)) = 0
( x-1/2 )
x-1/2 = 0 // + 1/2
x = 1/2
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 1/2}
x = 6
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