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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
x = 60/(x-4) // - 60/(x-4)
x-(60/(x-4)) = 0
x-60*(x-4)^-1 = 0
x-60/(x-4) = 0
(x*(x-4))/(x-4)-60/(x-4) = 0
x*(x-4)-60 = 0
x^2-4*x-60 = 0
x^2-4*x-60 = 0
x^2-4*x-60 = 0
DELTA = (-4)^2-(-60*1*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)+4)/(1*2) or x = (4-256^(1/2))/(1*2)
x = 10 or x = -6
(x+6)*(x-10) = 0
((x+6)*(x-10))/(x-4) = 0
((x+6)*(x-10))/(x-4) = 0 // * x-4
(x+6)*(x-10) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-10 )
x-10 = 0 // + 10
x = 10
x in { -6, 10 }
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