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D( x )
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
x in (-oo:-3/2) U (-3/2:+oo)
(6*x^2+5*x-15)/(2*x+3) = 0
6*x^2+5*x-15 = 0
6*x^2+5*x-15 = 0
DELTA = 5^2-(-15*4*6)
DELTA = 385
DELTA > 0
x = (385^(1/2)-5)/(2*6) or x = (-385^(1/2)-5)/(2*6)
x = (385^(1/2)-5)/12 or x = (-(385^(1/2)+5))/12
(x+(385^(1/2)+5)/12)*(x-((385^(1/2)-5)/12)) = 0
((x+(385^(1/2)+5)/12)*(x-((385^(1/2)-5)/12)))/(2*x+3) = 0
( x+(385^(1/2)+5)/12 )
x+(385^(1/2)+5)/12 = 0 // - (385^(1/2)+5)/12
x = -((385^(1/2)+5)/12)
( x-((385^(1/2)-5)/12) )
x-((385^(1/2)-5)/12) = 0 // + (385^(1/2)-5)/12
x = (385^(1/2)-5)/12
x in { -((385^(1/2)+5)/12), (385^(1/2)-5)/12 }
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