CALCULATE QUADRATIC EQUATION

fun quadraticEquation(a: Double, b: Double, c: Double): Double {
    val d = b * b - 4 * a * c
    return if (d > 0) {
        (-b + Math.sqrt(d)) / (2 * a)
    } else {
        (-b - Math.sqrt(d)) / (2 * a)
    }
}