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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)
(5*x^2+39*x+32)/(x+7) = 0
5*x^2+39*x+32 = 0
5*x^2+39*x+32 = 0
DELTA = 39^2-(4*5*32)
DELTA = 881
DELTA > 0
x = (881^(1/2)-39)/(2*5) or x = (-881^(1/2)-39)/(2*5)
x = (881^(1/2)-39)/10 or x = (-(881^(1/2)+39))/10
(x+(881^(1/2)+39)/10)*(x-((881^(1/2)-39)/10)) = 0
((x+(881^(1/2)+39)/10)*(x-((881^(1/2)-39)/10)))/(x+7) = 0
( x+(881^(1/2)+39)/10 )
x+(881^(1/2)+39)/10 = 0 // - (881^(1/2)+39)/10
x = -((881^(1/2)+39)/10)
( x-((881^(1/2)-39)/10) )
x-((881^(1/2)-39)/10) = 0 // + (881^(1/2)-39)/10
x = (881^(1/2)-39)/10
x in { -((881^(1/2)+39)/10), (881^(1/2)-39)/10 }
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