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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*(-6/x)*(6/x+9) = 0
-12*x^-1*(6*x^-1+9) = 0
( -12*x^-1 )
-12*x^-1 = 0 // : -12
x^-1 = 0
x naleu017Cy do O
( 6*x^-1+9 )
6*x^-1 = -9 // : 6
x^-1 = -3/2
-1 < 0
1/(x^1) = -3/2 // * x^1
1 = -3/2*x^1 // : -3/2
-2/3 = x^1
x = -2/3
x = -2/3
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