4=x-(21/x)

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Solution for 4=x-(21/x) equation: 


D( x )

x = 0

x = 0

x = 0

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

4 = x-(21/x) // - x-(21/x)

21/x-x+4 = 0

21*x^-1-1*x^1+4*x^0 = 0

(4*x^1-1*x^2+21*x^0)/(x^1) = 0 // * x^2

x^1*(4*x^1-1*x^2+21*x^0) = 0

x^1

4*x-x^2+21 = 0

4*x-x^2+21 = 0

DELTA = 4^2-(-1*4*21)

DELTA = 100

DELTA > 0

x = (100^(1/2)-4)/(-1*2) or x = (-100^(1/2)-4)/(-1*2)

x = -3 or x = 7

x in { -3, 7} 

x in { -3, 7 }

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