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D( x )
(x+1)^2 = 0
(x+1)^2 = 0
(x+1)^2 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
70 = 120/((x+1)^2) // - 120/((x+1)^2)
70-(120/((x+1)^2)) = 0
70-120*(x+1)^-2 = 0
70-120/((x+1)^2) = 0
(70*(x+1)^2)/((x+1)^2)-120/((x+1)^2) = 0
70*(x+1)^2-120 = 0
70*x^2+140*x-50 = 0
70*x^2+140*x-50 = 0
10*(7*x^2+14*x-5) = 0
7*x^2+14*x-5 = 0
DELTA = 14^2-(-5*4*7)
DELTA = 336
DELTA > 0
x = (336^(1/2)-14)/(2*7) or x = (-336^(1/2)-14)/(2*7)
x = (4*21^(1/2)-14)/14 or x = (-4*21^(1/2)-14)/14
10*(x-((-4*21^(1/2)-14)/14))*(x-((4*21^(1/2)-14)/14)) = 0
(10*(x-((-4*21^(1/2)-14)/14))*(x-((4*21^(1/2)-14)/14)))/((x+1)^2) = 0
(10*(x-((-4*21^(1/2)-14)/14))*(x-((4*21^(1/2)-14)/14)))/((x+1)^2) = 0 // * (x+1)^2
10*(x-((-4*21^(1/2)-14)/14))*(x-((4*21^(1/2)-14)/14)) = 0
( x-((-4*21^(1/2)-14)/14) )
x-((-4*21^(1/2)-14)/14) = 0 // + (-4*21^(1/2)-14)/14
x = (-4*21^(1/2)-14)/14
( x-((4*21^(1/2)-14)/14) )
x-((4*21^(1/2)-14)/14) = 0 // + (4*21^(1/2)-14)/14
x = (4*21^(1/2)-14)/14
x in { (-4*21^(1/2)-14)/14, (4*21^(1/2)-14)/14 }
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