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D( w )
w^2+13*w+42 = 0
w^2+13*w+42 = 0
w^2+13*w+42 = 0
w^2+13*w+42 = 0
DELTA = 13^2-(1*4*42)
DELTA = 1
DELTA > 0
w = (1^(1/2)-13)/(1*2) or w = (-1^(1/2)-13)/(1*2)
w = -6 or w = -7
w in (-oo:-7) U (-7:-6) U (-6:+oo)
(w+6)/(w^2+13*w+42) = 0
w^2+13*w+42 = 0
w^2+13*w+42 = 0
DELTA = 13^2-(1*4*42)
DELTA = 1
DELTA > 0
w = (1^(1/2)-13)/(1*2) or w = (-1^(1/2)-13)/(1*2)
w = -6 or w = -7
(w+7)*(w+6) = 0
(w+6)/((w+7)*(w+6)) = 0
w+6 = 0 // - 6
w = -6
w in { -6}
w belongs to the empty set
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