<div>
        <form id="form">
            Digite o A:&emsp;<input id="a" type="number">
            <br>
            <br>
            Digite o B:&emsp;<input id="b" type="number">
            <br>
            <br>
            Digite o C:&emsp;<input id="c" type="number">
            <br>
            <input type="submit">
        </form>
    </div>

function bhaskaraP(ab,bb,cb){
            var Mb = bb * -1
            var b2 = bb * bb
            var delta0 = b2  - 4*ab*cb
            var delta = Math.sqrt(delta0)
            var rstM = (Mb + delta)/2*ab
            return rstM
            }
        function bhaskaraN(ac,bc,cc){
            var Mbc = bc * -1
            var b2c = bc * bc
            var delta0c = b2c  - 4*ac*cc
            var deltac = Math.sqrt(delta0c)
            var rstN = (Mbc - deltac)/2*ac
            return rstN
            }
        var form = document.getElementById("form")
        var a = document.getElementById("a")
        var b = document.getElementById("b")
        var c = document.getElementById("c")
        var ax = a.value
        var bx = b.value
        var cx = c.value
        var bh1 = bhaskaraP(ax,bx,cx)
        var bh2 = bhaskaraN(ax,bx,cx)
        form.addEventListener('submit',function(){
            alert(bh1+" "+bh2)
        })