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D( x )
12*x^2-1 = 0
12*x^2-1 = 0
12*x^2-1 = 0
12*x^2 = 1 // : 12
x^2 = 1/12
x^2 = 1/12 // ^ 1/2
abs(x) = (1/12)^(1/2)
x = (1/12)^(1/2) or x = -(1/12)^(1/2)
x in (-oo:-(1/12)^(1/2)) U (-(1/12)^(1/2):(1/12)^(1/2)) U ((1/12)^(1/2):+oo)
(9*x^2-(7*x)-1)/(12*x^2-1) = 0
(9*x^2-7*x-1)/(12*x^2-1) = 0
9*x^2-7*x-1 = 0
9*x^2-7*x-1 = 0
DELTA = (-7)^2-(-1*4*9)
DELTA = 85
DELTA > 0
x = (85^(1/2)+7)/(2*9) or x = (7-85^(1/2))/(2*9)
x = (85^(1/2)+7)/18 or x = (7-85^(1/2))/18
(x-((7-85^(1/2))/18))*(x-((85^(1/2)+7)/18)) = 0
((x-((7-85^(1/2))/18))*(x-((85^(1/2)+7)/18)))/(12*x^2-1) = 0
( x-((7-85^(1/2))/18) )
x-((7-85^(1/2))/18) = 0 // + (7-85^(1/2))/18
x = (7-85^(1/2))/18
( x-((85^(1/2)+7)/18) )
x-((85^(1/2)+7)/18) = 0 // + (85^(1/2)+7)/18
x = (85^(1/2)+7)/18
x in { (7-85^(1/2))/18, (85^(1/2)+7)/18 }
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