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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
(4*x^2+20*x+7)/(x+5) = 0
4*x^2+20*x+7 = 0
4*x^2+20*x+7 = 0
DELTA = 20^2-(4*4*7)
DELTA = 288
DELTA > 0
x = (288^(1/2)-20)/(2*4) or x = (-288^(1/2)-20)/(2*4)
x = (12*2^(1/2)-20)/8 or x = (-12*2^(1/2)-20)/8
(x-((-12*2^(1/2)-20)/8))*(x-((12*2^(1/2)-20)/8)) = 0
((x-((-12*2^(1/2)-20)/8))*(x-((12*2^(1/2)-20)/8)))/(x+5) = 0
( x-((-12*2^(1/2)-20)/8) )
x-((-12*2^(1/2)-20)/8) = 0 // + (-12*2^(1/2)-20)/8
x = (-12*2^(1/2)-20)/8
( x-((12*2^(1/2)-20)/8) )
x-((12*2^(1/2)-20)/8) = 0 // + (12*2^(1/2)-20)/8
x = (12*2^(1/2)-20)/8
x in { (-12*2^(1/2)-20)/8, (12*2^(1/2)-20)/8 }
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