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D( x )
x*x-(12*x)+36 = 0
x*x-(12*x)+36 = 0
x*x-(12*x)+36 = 0
x*x-12*x+36 = 0
x^2-12*x+36 = 0
DELTA = (-12)^2-(1*4*36)
DELTA = 0
x = 12/(1*2)
x = 6 or x = 6
x in (-oo:6) U (6:+oo)
(x*x-36)/(x*x-(12*x)+36) = 0
(x*x-36)/(x*x-12*x+36) = 0
(x^2-36)/(x^2-12*x+36) = 0
x^2-12*x+36 = 0
x^2-12*x+36 = 0
DELTA = (-12)^2-(1*4*36)
DELTA = 0
x = 12/(1*2)
x = 6 or x = 6
(x-6)^2 = 0
(x^2-36)/((x-6)^2) = 0
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { 6}
x = -6
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