package main

import(
    "fmt"
    "github.com/khezen/rootfinding"
)

func f(x float64) float64 {
	return math.Pow(x, 4) - 2*math.Pow(x, 2) + 0.25
}

const(
    intervalStart = -100
    intervalEnd = 100
    precision = 6
)
func main(){
    root, err := rootfinding.Brent(f, intervalStart, intervalEnd, precision)
    if err != nil {
        panic(err)
    }
    fmt.Println(root)
}