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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
(3*x^2-(14*x)-5)/(x-5) = 0
(3*x^2-14*x-5)/(x-5) = 0
3*x^2-14*x-5 = 0
3*x^2-14*x-5 = 0
DELTA = (-14)^2-(-5*3*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)+14)/(2*3) or x = (14-256^(1/2))/(2*3)
x = 5 or x = -1/3
(x+1/3)*(x-5) = 0
x+1/3 = 0
x+1/3 = 0 // - 1/3
x = -1/3
x = -1/3
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