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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)
(4*x^2+31*x+22)/(x+7) = 0
4*x^2+31*x+22 = 0
4*x^2+31*x+22 = 0
DELTA = 31^2-(4*4*22)
DELTA = 609
DELTA > 0
x = (609^(1/2)-31)/(2*4) or x = (-609^(1/2)-31)/(2*4)
x = (609^(1/2)-31)/8 or x = (-(609^(1/2)+31))/8
(x+(609^(1/2)+31)/8)*(x-((609^(1/2)-31)/8)) = 0
((x+(609^(1/2)+31)/8)*(x-((609^(1/2)-31)/8)))/(x+7) = 0
( x+(609^(1/2)+31)/8 )
x+(609^(1/2)+31)/8 = 0 // - (609^(1/2)+31)/8
x = -((609^(1/2)+31)/8)
( x-((609^(1/2)-31)/8) )
x-((609^(1/2)-31)/8) = 0 // + (609^(1/2)-31)/8
x = (609^(1/2)-31)/8
x in { -((609^(1/2)+31)/8), (609^(1/2)-31)/8 }
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