The JavaScript Source: Math Related : Amazing Quadratic Equation Solver

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Amazing Quadratic Equation Solver

This script will factor and solve for both values of X, any quadratic equation that has real number solutions.

The Solution Will Appear Here!

The JavaScript Source: Math Related : Amazing Quadratic Equation Solver
Simply click inside the window below, use your cursor to highlight the script, and copy [Control]+C the script into a new file in your text editor (such as Note Pad) and save [Control+S]. The script is yours!!!

 /* This script and many more are available free online at The JavaScript Source :: http://javascript.internet.com Created by: Ben Kanaev :: http://www.webhostreview.biz */ var a,b,c,x1,x2; function getValues() { signB = (document.form.firstSign.value == "+") ? 1 : -1; signC = (document.form.secondSign.value == "+") ? 1 : -1; a = document.form.x2Coef.value; b = document.form.xCoef.value * signB; c = document.form.endValue.value * signC; } function solveForX() { x1 = ((-1*b) + Math.sqrt((b*b) - 4*a*c))/ (2*a); x2 = ((-1*b) - Math.sqrt((b*b) - 4*a*c))/ (2*a); if(document.form.round.checked){ x1 = Math.round(x1*1000)/1000; x2 = Math.round(x2*1000)/1000; } } function factorEq() { if( (Boolean(x1) != false) && (Boolean(x2) != false)) { x1Print = ((x1 * -1) > 0) ? "+" + (x1*-1) : x1 * -1; x2Print = ((x2 * -1) > 0) ? "+" + (x2*-1) : x2 * -1; aPrint = (a > 1 || a < 0) ? a : ""; document.getElementById('testing').innerHTML = "<font color=\"red\">The Solutions Are:</font><br>x1 = " + x1 + "; x2 = " + x2 + "<br><font color=\"red\"> The Equation Is:</font><br> " + aPrint + "(x " + x1Print + ") (x " + x2Print + ")"; } else { document.getElementById('testing').innerHTML = "<font color=\"red\"><b>YOUR INPUT PRODUCED AN ERROR:</b></font><br> You have entered a non-integer into one of the fields above, or the solution(s) for your equation is(are) an imaginary(s) number!"; } } function SolveEq() { getValues(); solveForX(); factorEq(); }  <script type="text/javascript" src="quadEquation.js"></script>  <div align="center"> <form name="form"> <input type="text" name="x2Coef" size="2" value="1"><b> X<sup>2</sup> </b> <select name="firstSign"> <option value="+">+</option> <option value="-">-</option> </select> <input typle="text" name="xCoef" size="2" value="1"><b> X</b> <select name="secondSign"> <option value="+">+</option> <option value="-">-</option> </select> <input type="text" name="endValue" size="2"><br> Round to the nearest thousandths?<input type="checkbox" name="round">Yes<br><br> <input type="button" value="Solve!" onClick="SolveEq()"> </form> <p id="testing" style="width: 400px; height: 100px; border-width: 2px; border-style: groove; border-color: orange; font-size: 16px; color: blue; vertical-align: center">The Solution Will Appear Here!</p> </div> <p><div align="center"> <font face="arial, helvetica" size"-2">Free JavaScripts provided<br> by <a href="http://javascriptsource.com">The JavaScript Source</a></font> </div><p>
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