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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(4*x^2-(7*x)-7)/(x-2) = 0
(4*x^2-7*x-7)/(x-2) = 0
4*x^2-7*x-7 = 0
4*x^2-7*x-7 = 0
DELTA = (-7)^2-(-7*4*4)
DELTA = 161
DELTA > 0
x = (161^(1/2)+7)/(2*4) or x = (7-161^(1/2))/(2*4)
x = (161^(1/2)+7)/8 or x = (7-161^(1/2))/8
(x-((7-161^(1/2))/8))*(x-((161^(1/2)+7)/8)) = 0
((x-((7-161^(1/2))/8))*(x-((161^(1/2)+7)/8)))/(x-2) = 0
( x-((161^(1/2)+7)/8) )
x-((161^(1/2)+7)/8) = 0 // + (161^(1/2)+7)/8
x = (161^(1/2)+7)/8
( x-((7-161^(1/2))/8) )
x-((7-161^(1/2))/8) = 0 // + (7-161^(1/2))/8
x = (7-161^(1/2))/8
x in { (161^(1/2)+7)/8, (7-161^(1/2))/8 }
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