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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(3*x^2+2*x-48)/(x-6) = 0
3*x^2+2*x-48 = 0
3*x^2+2*x-48 = 0
DELTA = 2^2-(-48*3*4)
DELTA = 580
DELTA > 0
x = (580^(1/2)-2)/(2*3) or x = (-580^(1/2)-2)/(2*3)
x = (2*145^(1/2)-2)/6 or x = (-2*145^(1/2)-2)/6
(x-((-2*145^(1/2)-2)/6))*(x-((2*145^(1/2)-2)/6)) = 0
((x-((-2*145^(1/2)-2)/6))*(x-((2*145^(1/2)-2)/6)))/(x-6) = 0
( x-((-2*145^(1/2)-2)/6) )
x-((-2*145^(1/2)-2)/6) = 0 // + (-2*145^(1/2)-2)/6
x = (-2*145^(1/2)-2)/6
( x-((2*145^(1/2)-2)/6) )
x-((2*145^(1/2)-2)/6) = 0 // + (2*145^(1/2)-2)/6
x = (2*145^(1/2)-2)/6
x in { (-2*145^(1/2)-2)/6, (2*145^(1/2)-2)/6 }
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