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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(2*x^2-(12*x^2)+13*x+15)/(x-3) = 0
(2*x^2-12*x^2+13*x+15)/(x-3) = 0
(13*x-10*x^2+15)/(x-3) = 0
13*x-10*x^2+15 = 0
13*x-10*x^2+15 = 0
DELTA = 13^2-(-10*4*15)
DELTA = 769
DELTA > 0
x = (769^(1/2)-13)/(-10*2) or x = (-769^(1/2)-13)/(-10*2)
x = (769^(1/2)-13)/(-20) or x = (769^(1/2)+13)/20
(x-((769^(1/2)-13)/(-20)))*(x-((769^(1/2)+13)/20)) = 0
((x-((769^(1/2)-13)/(-20)))*(x-((769^(1/2)+13)/20)))/(x-3) = 0
( x-((769^(1/2)+13)/20) )
x-((769^(1/2)+13)/20) = 0 // + (769^(1/2)+13)/20
x = (769^(1/2)+13)/20
( x-((769^(1/2)-13)/(-20)) )
x-((769^(1/2)-13)/(-20)) = 0 // + (769^(1/2)-13)/(-20)
x = (769^(1/2)-13)/(-20)
x in { (769^(1/2)+13)/20, (769^(1/2)-13)/(-20) }
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