21/x=x/336

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Solution for 21/x=x/336 equation: 


D( x )

x = 0

x = 0

x = 0

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

21/x = x/336 // - x/336

21/x-(x/336) = 0

21*x^-1-1/336*x^1 = 0

(21*x^0-1/336*x^2)/(x^1) = 0 // * x^2

x^1*(21*x^0-1/336*x^2) = 0

x^1

(-1/336)*x^2+21 = 0

(-1/336)*x^2+21 = 0

DELTA = 0^2-(4*21*(-1/336))

DELTA = 1/4

DELTA > 0

x = ((1/4)^(1/2)+0)/(2*(-1/336)) or x = (0-(1/4)^(1/2))/(2*(-1/336))

x = -84 or x = 84

x in { -84, 84} 

x in { -84, 84 }

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