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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(3*x^2+5*x-4)/(x-4) = 0
3*x^2+5*x-4 = 0
3*x^2+5*x-4 = 0
DELTA = 5^2-(-4*3*4)
DELTA = 73
DELTA > 0
x = (73^(1/2)-5)/(2*3) or x = (-73^(1/2)-5)/(2*3)
x = (73^(1/2)-5)/6 or x = (-(73^(1/2)+5))/6
(x+(73^(1/2)+5)/6)*(x-((73^(1/2)-5)/6)) = 0
((x+(73^(1/2)+5)/6)*(x-((73^(1/2)-5)/6)))/(x-4) = 0
( x+(73^(1/2)+5)/6 )
x+(73^(1/2)+5)/6 = 0 // - (73^(1/2)+5)/6
x = -((73^(1/2)+5)/6)
( x-((73^(1/2)-5)/6) )
x-((73^(1/2)-5)/6) = 0 // + (73^(1/2)-5)/6
x = (73^(1/2)-5)/6
x in { -((73^(1/2)+5)/6), (73^(1/2)-5)/6 }
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