(m/n)x^2 + n/m = 1 - 2x
m/n x2+n/m =1-2x
mn*m/n x2+mn*n/m =mn*1-mn*2x
m2 x2+n2 = m n-2xmn
m2 x2+2 x m n+n2-m n =0
m2 x2+2 m n x+n(n-m) =0
therfore, x =[-2 m n +- {(-2 m n )2- 4 m2 n (n-m)}1/2] / 2m2 [using,fomula]
=[-2 m n+-{4 m2 n2-4 m2 n2+4 m3 n}1/2] / 2m2 [power of 1/2 means rootover]
=[-2mn+{-4m3n}1/2] / 2m2
={-2mn+-2m*(mn)1/2} / 2m2
=-n+-(mn)1/2/ m [by cancelling 2m]
=-n/m+-(n/m)1/2
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