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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
(4*x^2+5*x-11)/(x+5) = 0
4*x^2+5*x-11 = 0
4*x^2+5*x-11 = 0
DELTA = 5^2-(-11*4*4)
DELTA = 201
DELTA > 0
x = (201^(1/2)-5)/(2*4) or x = (-201^(1/2)-5)/(2*4)
x = (201^(1/2)-5)/8 or x = (-(201^(1/2)+5))/8
(x+(201^(1/2)+5)/8)*(x-((201^(1/2)-5)/8)) = 0
((x+(201^(1/2)+5)/8)*(x-((201^(1/2)-5)/8)))/(x+5) = 0
( x+(201^(1/2)+5)/8 )
x+(201^(1/2)+5)/8 = 0 // - (201^(1/2)+5)/8
x = -((201^(1/2)+5)/8)
( x-((201^(1/2)-5)/8) )
x-((201^(1/2)-5)/8) = 0 // + (201^(1/2)-5)/8
x = (201^(1/2)-5)/8
x in { -((201^(1/2)+5)/8), (201^(1/2)-5)/8 }
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