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D( x )
x^2-(12*x)+36 = 0
x^2-(12*x)+36 = 0
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 in (-oo:6) U (6:+oo)
7/(x^2-(12*x)+36) = 0
7/(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
7/((x-6)^2) = 0
x belongs to the empty set
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