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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-3*x-(10/x) = 20 // - 20
-3*x-(10/x)-20 = 0
-3*x-10*x^-1-20 = 0
-3*x^1-10*x^-1-20*x^0 = 0
(-3*x^2-20*x^1-10*x^0)/(x^1) = 0 // * x^2
x^1*(-3*x^2-20*x^1-10*x^0) = 0
x^1
-3*x^2-20*x-10 = 0
-3*x^2-20*x-10 = 0
DELTA = (-20)^2-(-10*(-3)*4)
DELTA = 280
DELTA > 0
x = (280^(1/2)+20)/(-3*2) or x = (20-280^(1/2))/(-3*2)
x = (2*70^(1/2)+20)/(-6) or x = (20-2*70^(1/2))/(-6)
x in { (2*70^(1/2)+20)/(-6), (20-2*70^(1/2))/(-6)}
x in { (2*70^(1/2)+20)/(-6), (20-2*70^(1/2))/(-6) }
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