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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)
(6*x^2+25*x+25)/(2*x+5) = 0
6*x^2+25*x+25 = 0
6*x^2+25*x+25 = 0
DELTA = 25^2-(4*6*25)
DELTA = 25
DELTA > 0
x = (25^(1/2)-25)/(2*6) or x = (-25^(1/2)-25)/(2*6)
x = -5/3 or x = -5/2
(x+5/2)*(x+5/3) = 0
((x+5/2)*(x+5/3))/(2*x+5) = 0
( x+5/2 )
x+5/2 = 0 // - 5/2
x = -5/2
( x+5/3 )
x+5/3 = 0 // - 5/3
x = -5/3
x in { -5/2}
x = -5/3
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