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When the $\text{Newton-Raphson}$ method is applied to solve the equation  $f(x)=x^3+2x-1=0$ ,the solution at the end of the first iteration with the initial guess value as $x_0$ =$1.2$ is

  1. $-0.82$
  2. $0.49$
  3. $0.705$
  4. $1.69$
in Power Systems by (1.5k points)
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