Javascript inductance calculation

I've got this formula: L=P (N^2 + N ) / 1.25 + 0.7 x F

I need to write it in Javascript, I've got general error checking code, then I get to the point of calculating the inductance.

var N = parseFloat($("#Number").val());
var P = parseFloat($("#Perimeter").val());
var F = parseFloat($("#Feeder").val());
var L = P (Math.pow(N,2) + N) / 1.25 + 0.7 * F
$("#result").html(L); 

I tested just adding the variables to start, now I added the formu开发者_StackOverflow社区la in, but no result shows.

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You're missing a * here:

var L = P (Math.pow(N,2) + N) / 1.25 + 0.7 * F

Try:

var L = P * (Math.pow(N,2) + N) / 1.25 + 0.7 * F

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You need an operator after P:

var L = P * (Math.pow(N,2) + N) / 1.25 + 0.7 * F

I'm not sure about the proper order here (it's been a while since Phys II), so you may want to add some parentheses to be sure the operations happen in the order they should.

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You are missing a * here without which javascript is treating P (Math.pow(N,2) + N) as a call to a function P with parameter as Math.pow(N,2) + N

Try this:

var L = P * (Math.pow(N,2) + N) / 1.25 + 0.7 * F