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D( x )
2*x+5 = 0
2*x+5 = 0
2*x+5 = 0
2*x+5 = 0 // - 5
2*x = -5 // : 2
x = -5/2
x in (-oo:-5/2) U (-5/2:+oo)
(2*x^2+11*x-14)/(2*x+5) = 0
2*x^2+11*x-14 = 0
2*x^2+11*x-14 = 0
DELTA = 11^2-(-14*2*4)
DELTA = 233
DELTA > 0
x = (233^(1/2)-11)/(2*2) or x = (-233^(1/2)-11)/(2*2)
x = (233^(1/2)-11)/4 or x = (-(233^(1/2)+11))/4
(x+(233^(1/2)+11)/4)*(x-((233^(1/2)-11)/4)) = 0
((x+(233^(1/2)+11)/4)*(x-((233^(1/2)-11)/4)))/(2*x+5) = 0
( x+(233^(1/2)+11)/4 )
x+(233^(1/2)+11)/4 = 0 // - (233^(1/2)+11)/4
x = -((233^(1/2)+11)/4)
( x-((233^(1/2)-11)/4) )
x-((233^(1/2)-11)/4) = 0 // + (233^(1/2)-11)/4
x = (233^(1/2)-11)/4
x in { -((233^(1/2)+11)/4), (233^(1/2)-11)/4 }
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