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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+42*X+47)/(X+7) = 0
5*X^2+42*X+47 = 0
5*X^2+42*X+47 = 0
DELTA = 42^2-(4*5*47)
DELTA = 824
DELTA > 0
X = (824^(1/2)-42)/(2*5) or X = (-824^(1/2)-42)/(2*5)
X = (2*206^(1/2)-42)/10 or X = (-2*206^(1/2)-42)/10
(X-((-2*206^(1/2)-42)/10))*(X-((2*206^(1/2)-42)/10)) = 0
((X-((-2*206^(1/2)-42)/10))*(X-((2*206^(1/2)-42)/10)))/(X+7) = 0
( X-((-2*206^(1/2)-42)/10) )
X-((-2*206^(1/2)-42)/10) = 0 // + (-2*206^(1/2)-42)/10
X = (-2*206^(1/2)-42)/10
( X-((2*206^(1/2)-42)/10) )
X-((2*206^(1/2)-42)/10) = 0 // + (2*206^(1/2)-42)/10
X = (2*206^(1/2)-42)/10
X in { (-2*206^(1/2)-42)/10, (2*206^(1/2)-42)/10 }
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