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D( x )
5*x^2-(35*x) = 0
5*x^2-(35*x) = 0
5*x^2-(35*x) = 0
5*x^2-35*x = 0
5*x^2-35*x = 0
DELTA = (-35)^2-(0*4*5)
DELTA = 1225
DELTA > 0
x = (1225^(1/2)+35)/(2*5) or x = (35-1225^(1/2))/(2*5)
x = 7 or x = 0
x in (-oo:0) U (0:7) U (7:+oo)
(10*x^2-(25*x))/(5*x^2-(35*x)) = 0
(10*x^2-25*x)/(5*x^2-35*x) = 0
10*x^2-25*x = 0
5*x*(2*x-5) = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
5*x*(x-5/2) = 0
5*x^2-35*x = 0
5*x*(x-7) = 0
x-7 = 0 // + 7
x = 7
5*x*(x-7) = 0
(5*x*(x-5/2))/(5*x*(x-7)) = 0
( 5*x )
5*x = 0 // : 5
x = 0
( x-5/2 )
x-5/2 = 0 // + 5/2
x = 5/2
x in { 0}
x = 5/2
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