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D( x )
10*x-x^2 = 0
10*x-x^2 = 0
10*x-x^2 = 0
10*x-x^2 = 0
DELTA = 10^2-(-1*0*4)
DELTA = 100
DELTA > 0
x = (100^(1/2)-10)/(-1*2) or x = (-100^(1/2)-10)/(-1*2)
x = 0 or x = 10
x in (-oo:0) U (0:10) U (10:+oo)
(12*x-x^2)/(10*x-x^2) = 0
12*x-x^2 = 0
x*(12-x) = 0
12-x = 0 // - 12
-x = -12 // * -1
x = 12
x*(x-12) = 0
10*x-x^2 = 0
x*(10-x) = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x*(x-10) = 0
(x*(x-12))/(x*(x-10)) = 0
( x-12 )
x-12 = 0 // + 12
x = 12
( x )
x = 0
x in { 0}
x = 12
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