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D( x )
x^2-(5*x) = 0
x^2-(5*x) = 0
x^2-(5*x) = 0
x^2-5*x = 0
x^2-5*x = 0
DELTA = (-5)^2-(0*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+5)/(1*2) or x = (5-25^(1/2))/(1*2)
x = 5 or x = 0
x in (-oo:0) U (0:5) U (5:+oo)
(21*x-13)/(x^2-(5*x)) = 3 // - 3
(21*x-13)/(x^2-(5*x))-3 = 0
(21*x-13)/(x^2-5*x)-3 = 0
x^2-5*x = 0
x^2-5*x = 0
x*(x-5) = 0
x-5 = 0 // + 5
x = 5
x*(x-5) = 0
(21*x-13)/(x*(x-5))-3 = 0
(21*x-13)/(x*(x-5))+(-3*x*(x-5))/(x*(x-5)) = 0
21*x-3*x*(x-5)-13 = 0
36*x-3*x^2-13 = 0
36*x-3*x^2-13 = 0
36*x-3*x^2-13 = 0
DELTA = 36^2-(-13*(-3)*4)
DELTA = 1140
DELTA > 0
x = (1140^(1/2)-36)/(-3*2) or x = (-1140^(1/2)-36)/(-3*2)
x = (2*285^(1/2)-36)/(-6) or x = (-2*285^(1/2)-36)/(-6)
(x-((2*285^(1/2)-36)/(-6)))*(x-((-2*285^(1/2)-36)/(-6))) = 0
((x-((2*285^(1/2)-36)/(-6)))*(x-((-2*285^(1/2)-36)/(-6))))/(x*(x-5)) = 0
((x-((2*285^(1/2)-36)/(-6)))*(x-((-2*285^(1/2)-36)/(-6))))/(x*(x-5)) = 0 // * x*(x-5)
(x-((2*285^(1/2)-36)/(-6)))*(x-((-2*285^(1/2)-36)/(-6))) = 0
( x-((-2*285^(1/2)-36)/(-6)) )
x-((-2*285^(1/2)-36)/(-6)) = 0 // + (-2*285^(1/2)-36)/(-6)
x = (-2*285^(1/2)-36)/(-6)
( x-((2*285^(1/2)-36)/(-6)) )
x-((2*285^(1/2)-36)/(-6)) = 0 // + (2*285^(1/2)-36)/(-6)
x = (2*285^(1/2)-36)/(-6)
x in { (-2*285^(1/2)-36)/(-6), (2*285^(1/2)-36)/(-6) }
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