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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/(x^2)-(7*x)+12 = 0
(2*x)/(x^2)-7*x+12 = 0
2*x^-1-7*x^1+12*x^0 = 0
(12*x^1-7*x^2+2*x^0)/(x^1) = 0 // * x^2
x^1*(12*x^1-7*x^2+2*x^0) = 0
x^1
12*x-7*x^2+2 = 0
12*x-7*x^2+2 = 0
DELTA = 12^2-(-7*2*4)
DELTA = 200
DELTA > 0
x = (200^(1/2)-12)/(-7*2) or x = (-200^(1/2)-12)/(-7*2)
x = (10*2^(1/2)-12)/(-14) or x = (-10*2^(1/2)-12)/(-14)
x in { (10*2^(1/2)-12)/(-14), (-10*2^(1/2)-12)/(-14)}
x in { (10*2^(1/2)-12)/(-14), (-10*2^(1/2)-12)/(-14) }
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