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iOS

bhaskara app

I 'm trying to make an application that calculates Bhaskara however I do not know what to do if the delta of an irrational number that is a root of a number , please help . my code like this :

// p.s: Code in Portugues

func bhaskara (#a: Double, b: Double, c: Double) -> (String) {

    var Δ : Double = (b * b) - (4 * (a) * (c))
    var raizDeDelta = sqrt(Δ)
    var x1 : Double = (-b + raizDeDelta) / 2 * a
    var x2 : Double = (-b - raizDeDelta) / 2 * a
    var solucao = "S = {\(x2), \(x1)}"
    var verificacaoSeONumeroEInfinito : Bool

    if solucao == "S = {nan, nan}" {
       solucao = "S = Ø"
    }
    if raizDeDelta.isInfinite {

    }

    return solucao
}