JavaScript: SyntaxError missing ) after argument list

Question

var quadraticFormula = function(a, b, c) {

        console.log((-b + sqrt( (b*b) - 4 * a * c)) / 2a) };

quadraticFormula(2,2,2)

I am a beginner trying to make a simple quadratic equation calculator on javascript. I keep on getting a syntax error message saying "missing ) after argument list". What is wrong with my code?

@Paul: that doesn't matter in JS. @Tae Rugh: 2a isn't a valid token. (I assume you have a sqrt function somewhere.) — user1106925
– user1106925, Commented Jul 1, 2015 at 20:44

mziccard · Accepted Answer · 2015-07-01 20:49:47Z

4

Try adding a * sign in 2a:

var quadraticFormula = function(a, b, c) {

        console.log((-b + Math.sqrt( (b*b) - 4 * a * c)) / (2*a));

};

Also sqrt is part of Math so invoke it with Math.sqrt. Notice that quadraticFormula(2,2,2) will print NaN as it will try to do the square root of a negative number: (2*2) - 4 * 2 * 2.

Edit:
I wrapped 2*a inside () to correct the quadratic formula.

edited Jul 1, 2015 at 20:49

answered Jul 1, 2015 at 20:45

mziccard

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1 Comment

user1106925 Over a year ago

They probably intend (2 * a) if that's what they were trying to do with 2a but +1.

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