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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)
60/(x-4) = x // - x
60/(x-4)-x = 0
60/(x-4)+(-x*(x-4))/(x-4) = 0
60-x*(x-4) = 0
4*x-x^2+60 = 0
4*x-x^2+60 = 0
4*x-x^2+60 = 0
DELTA = 4^2-(-1*4*60)
DELTA = 256
DELTA > 0
x = (256^(1/2)-4)/(-1*2) or x = (-256^(1/2)-4)/(-1*2)
x = -6 or x = 10
(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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