Chapter 6, Problem 26P

Fir Prob. 6.25, the root can be located with fixed-point iteration as

$c={\left(\frac{W-Qc}{kV}\right)}^2$

or as

$c=\frac{W-kV\sqrt{c}}{Q}$

Only one will converge for initial guesses of $2<c<6$. Select the correct one and demonstrate why it will always work.