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D( x )
2*x-(13*x^2)-(12*x)-15 = 0
2*x-(13*x^2)-(12*x)-15 = 0
2*x-(13*x^2)-(12*x)-15 = 0
2*x-13*x^2-12*x-15 = 0
-13*x^2-10*x-15 = 0
DELTA = (-10)^2-(-15*(-13)*4)
DELTA = -680
DELTA < 0
x in (-oo:+oo)
(15*x)/(2*x-(13*x^2)-(12*x)-15) = 0
(15*x)/(2*x-13*x^2-12*x-15) = 0
(15*x)/(-13*x^2-10*x-15) = 0
-13*x^2-10*x-15 = 0
-1*(13*x^2+10*x+15) = 0
13*x^2+10*x+15 = 0
DELTA = 10^2-(4*13*15)
DELTA = -680
DELTA < 0
-1 = 0
(15*x)/(-1) = 0
15*x = 0 // : 15
x = 0
x = 0
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