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D( x )
x^2+11*x+30 = 0
x^2+11*x+30 = 0
x^2+11*x+30 = 0
x^2+11*x+30 = 0
DELTA = 11^2-(1*4*30)
DELTA = 1
DELTA > 0
x = (1^(1/2)-11)/(1*2) or x = (-1^(1/2)-11)/(1*2)
x = -5 or x = -6
x in (-oo:-6) U (-6:-5) U (-5:+oo)
(x^2+8*x+15)/(x^2+11*x+30) = 0
x^2+8*x+15 = 0
x^2+8*x+15 = 0
DELTA = 8^2-(1*4*15)
DELTA = 4
DELTA > 0
x = (4^(1/2)-8)/(1*2) or x = (-4^(1/2)-8)/(1*2)
x = -3 or x = -5
(x+5)*(x+3) = 0
x^2+11*x+30 = 0
x^2+11*x+30 = 0
DELTA = 11^2-(1*4*30)
DELTA = 1
DELTA > 0
x = (1^(1/2)-11)/(1*2) or x = (-1^(1/2)-11)/(1*2)
x = -5 or x = -6
(x+6)*(x+5) = 0
((x+5)*(x+3))/((x+6)*(x+5)) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x+5 )
x+5 = 0 // - 5
x = -5
x in { -5}
x = -3
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