Help with writing a program to find roots

2 次查看（过去 30 天）

Steven 2012-3-31

I need help making a function file that can find the roots of a polynomial.

For example I need to find the roots of 2x^2 + 10x + 12.

I've started off the function:

function p = findroots(a, b, c)

I dont know what else to put after, I've tried so many different ways.

PLEASE HELP.

Rick Rosson 2012-3-31

Please try:

   function p = findroots(a,b,c)
       d = sqrt(b^2 - 4*a*c);
       p =  (-b + [ -1  +1 ]*d) / (2*a);
   end

Alternatively:

p = roots([ a b c ]);

HTH.

Rick

Steven 2012-4-1

thank you

MATLAB Mathematics Elementary Math Polynomials

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