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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.97 = (3.2*3.2)/x // - (3.2*3.2)/x
3.97-((3.2*3.2)/x) = 0
3.97-10.24*x^-1 = 0
-10.24*x^-1 = -3.97 // : -10.24
x^-1 = 0.38769531
-1 < 0
1/(x^1) = 0.38769531 // * x^1
1 = 0.38769531*x^1 // : 0.38769531
2.5793451 = x^1
x = 2.5793451
x = 2.5793451
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