Square root approximation algorithm in Go

sqrt.go

package main

import (
	"fmt"
	"math"
)

func Sqrt(x float64) (float64, int) {
  z := x/2
  prev := 0.0
  i := 0
  for math.Abs(z-prev) > math.Pow(10, -5) {
    i++
    prev = z
    z -= (z*z - x) / (2*z);
  }
  return z,i
}

func main() {
  result, nOfIterations := Sqrt(56)
  fmt.Printf("the result is %f and that was done in %d iterations\n", result, nOfIterations)
}