2x-3=20/x

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Solution for 2x-3=20/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

2*x-3 = 20/x // - 20/x

2*x-(20/x)-3 = 0

2*x-20*x^-1-3 = 0

2*x^1-20*x^-1-3*x^0 = 0

(2*x^2-3*x^1-20*x^0)/(x^1) = 0 // * x^2

x^1*(2*x^2-3*x^1-20*x^0) = 0

x^1

2*x^2-3*x-20 = 0

2*x^2-3*x-20 = 0

DELTA = (-3)^2-(-20*2*4)

DELTA = 169

DELTA > 0

x = (169^(1/2)+3)/(2*2) or x = (3-169^(1/2))/(2*2)

x = 4 or x = -5/2

x in { -5/2, 4} 

x in { -5/2, 4 }

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