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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)
(4*x^2+19*x+13)/(x+4) = 0
4*x^2+19*x+13 = 0
4*x^2+19*x+13 = 0
DELTA = 19^2-(4*4*13)
DELTA = 153
DELTA > 0
x = (153^(1/2)-19)/(2*4) or x = (-153^(1/2)-19)/(2*4)
x = (3*17^(1/2)-19)/8 or x = (-3*17^(1/2)-19)/8
(x-((-3*17^(1/2)-19)/8))*(x-((3*17^(1/2)-19)/8)) = 0
((x-((-3*17^(1/2)-19)/8))*(x-((3*17^(1/2)-19)/8)))/(x+4) = 0
( x-((-3*17^(1/2)-19)/8) )
x-((-3*17^(1/2)-19)/8) = 0 // + (-3*17^(1/2)-19)/8
x = (-3*17^(1/2)-19)/8
( x-((3*17^(1/2)-19)/8) )
x-((3*17^(1/2)-19)/8) = 0 // + (3*17^(1/2)-19)/8
x = (3*17^(1/2)-19)/8
x in { (-3*17^(1/2)-19)/8, (3*17^(1/2)-19)/8 }
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