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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)
(x^2+4*x-13)/(x+6) = 0
x^2+4*x-13 = 0
x^2+4*x-13 = 0
DELTA = 4^2-(-13*1*4)
DELTA = 68
DELTA > 0
x = (68^(1/2)-4)/(1*2) or x = (-68^(1/2)-4)/(1*2)
x = (2*17^(1/2)-4)/2 or x = (-2*17^(1/2)-4)/2
(x-((-2*17^(1/2)-4)/2))*(x-((2*17^(1/2)-4)/2)) = 0
((x-((-2*17^(1/2)-4)/2))*(x-((2*17^(1/2)-4)/2)))/(x+6) = 0
( x-((-2*17^(1/2)-4)/2) )
x-((-2*17^(1/2)-4)/2) = 0 // + (-2*17^(1/2)-4)/2
x = (-2*17^(1/2)-4)/2
( x-((2*17^(1/2)-4)/2) )
x-((2*17^(1/2)-4)/2) = 0 // + (2*17^(1/2)-4)/2
x = (2*17^(1/2)-4)/2
x in { (-2*17^(1/2)-4)/2, (2*17^(1/2)-4)/2 }
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