- #1
d2j2003
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Homework Statement
Suppose w is not in the interval [-R,R] show that the equation z+[itex]\frac{R^{2}}{z}[/itex]=2w has one solution z with |z|<R and one solution z with |z|>R
Homework Equations
none
The Attempt at a Solution
the book mentions that the quadratic is left unchanged by the substitution of [itex]\frac{R^{2}}{z}[/itex] for z which I understand.
It then goes on to say that because of this, the two roots z[itex]_{1}[/itex] and z[itex]_{2}[/itex]are related by z[itex]_{1}[/itex]z[itex]_{2}[/itex]=R[itex]^{2}[/itex] which is where I get lost..
any help is appreciated. Thanks