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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
x = 40/(x+6) // - 40/(x+6)
x-(40/(x+6)) = 0
x-40*(x+6)^-1 = 0
x-40/(x+6) = 0
(x*(x+6))/(x+6)-40/(x+6) = 0
x*(x+6)-40 = 0
x^2+6*x-40 = 0
x^2+6*x-40 = 0
x^2+6*x-40 = 0
DELTA = 6^2-(-40*1*4)
DELTA = 196
DELTA > 0
x = (196^(1/2)-6)/(1*2) or x = (-196^(1/2)-6)/(1*2)
x = 4 or x = -10
(x+10)*(x-4) = 0
((x+10)*(x-4))/(x+6) = 0
((x+10)*(x-4))/(x+6) = 0 // * x+6
(x+10)*(x-4) = 0
( x+10 )
x+10 = 0 // - 10
x = -10
( x-4 )
x-4 = 0 // + 4
x = 4
x in { -10, 4 }
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