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D( x )
x+7 = 0
x+7 = 0
x+7 = 0
x+7 = 0 // - 7
x = -7
x in (-oo:-7) U (-7:+oo)
(6*x^2+48*x+46)/(x+7) = 0
6*x^2+48*x+46 = 0
2*(3*x^2+24*x+23) = 0
3*x^2+24*x+23 = 0
DELTA = 24^2-(3*4*23)
DELTA = 300
DELTA > 0
x = (300^(1/2)-24)/(2*3) or x = (-300^(1/2)-24)/(2*3)
x = (10*3^(1/2)-24)/6 or x = (-10*3^(1/2)-24)/6
2*(x-((-10*3^(1/2)-24)/6))*(x-((10*3^(1/2)-24)/6)) = 0
(2*(x-((-10*3^(1/2)-24)/6))*(x-((10*3^(1/2)-24)/6)))/(x+7) = 0
( x-((-10*3^(1/2)-24)/6) )
x-((-10*3^(1/2)-24)/6) = 0 // + (-10*3^(1/2)-24)/6
x = (-10*3^(1/2)-24)/6
( x-((10*3^(1/2)-24)/6) )
x-((10*3^(1/2)-24)/6) = 0 // + (10*3^(1/2)-24)/6
x = (10*3^(1/2)-24)/6
x in { (-10*3^(1/2)-24)/6, (10*3^(1/2)-24)/6 }
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