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D( x )
4*x^2-(24*x)+36 = 0
4*x^2-(24*x)+36 = 0
4*x^2-(24*x)+36 = 0
4*x^2-24*x+36 = 0
4*x^2-24*x+36 = 0
DELTA = (-24)^2-(4*4*36)
DELTA = 0
x = 24/(2*4)
x = 3 or x = 3
x in (-oo:3) U (3:+oo)
(8*x^2-72)/(4*x^2-(24*x)+36) = 0
(8*x^2-72)/(4*x^2-24*x+36) = 0
4*x^2-24*x+36 = 0
4*(x^2-6*x+9) = 0
x^2-6*x+9 = 0
DELTA = (-6)^2-(1*4*9)
DELTA = 0
x = 6/(1*2)
x = 3 or x = 3
4*(x-3)^2 = 0
(8*x^2-72)/(4*(x-3)^2) = 0
8*x^2 = 72 // : 8
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3}
x = -3
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