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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(4*x^2+15*x+8)/(x+3) = 0
4*x^2+15*x+8 = 0
4*x^2+15*x+8 = 0
DELTA = 15^2-(4*4*8)
DELTA = 97
DELTA > 0
x = (97^(1/2)-15)/(2*4) or x = (-97^(1/2)-15)/(2*4)
x = (97^(1/2)-15)/8 or x = (-(97^(1/2)+15))/8
(x+(97^(1/2)+15)/8)*(x-((97^(1/2)-15)/8)) = 0
((x+(97^(1/2)+15)/8)*(x-((97^(1/2)-15)/8)))/(x+3) = 0
( x+(97^(1/2)+15)/8 )
x+(97^(1/2)+15)/8 = 0 // - (97^(1/2)+15)/8
x = -((97^(1/2)+15)/8)
( x-((97^(1/2)-15)/8) )
x-((97^(1/2)-15)/8) = 0 // + (97^(1/2)-15)/8
x = (97^(1/2)-15)/8
x in { -((97^(1/2)+15)/8), (97^(1/2)-15)/8 }
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