x-7/x-4

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Solution for x-7/x-4 equation: 


D( x )

x = 0

x = 0

x = 0

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

x-(7/x)-4 = 0

x-7*x^-1-4 = 0

1*x^1-7*x^-1-4*x^0 = 0

(1*x^2-4*x^1-7*x^0)/(x^1) = 0 // * x^2

x^1*(1*x^2-4*x^1-7*x^0) = 0

x^1

x^2-4*x-7 = 0

x^2-4*x-7 = 0

DELTA = (-4)^2-(-7*1*4)

DELTA = 44

DELTA > 0

x = (44^(1/2)+4)/(1*2) or x = (4-44^(1/2))/(1*2)

x = (2*11^(1/2)+4)/2 or x = (4-2*11^(1/2))/2

x in { (4-2*11^(1/2))/2, (2*11^(1/2)+4)/2} 

x in { (4-2*11^(1/2))/2, (2*11^(1/2)+4)/2 }

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