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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+26*x+28)/(x-5) = 0
4*x^2+26*x+28 = 0
2*(2*x^2+13*x+14) = 0
2*x^2+13*x+14 = 0
DELTA = 13^2-(2*4*14)
DELTA = 57
DELTA > 0
x = (57^(1/2)-13)/(2*2) or x = (-57^(1/2)-13)/(2*2)
x = (57^(1/2)-13)/4 or x = (-(57^(1/2)+13))/4
2*(x+(57^(1/2)+13)/4)*(x-((57^(1/2)-13)/4)) = 0
(2*(x+(57^(1/2)+13)/4)*(x-((57^(1/2)-13)/4)))/(x-5) = 0
( x+(57^(1/2)+13)/4 )
x+(57^(1/2)+13)/4 = 0 // - (57^(1/2)+13)/4
x = -((57^(1/2)+13)/4)
( x-((57^(1/2)-13)/4) )
x-((57^(1/2)-13)/4) = 0 // + (57^(1/2)-13)/4
x = (57^(1/2)-13)/4
x in { -((57^(1/2)+13)/4), (57^(1/2)-13)/4 }
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