How do you write a polynomial when given three roots?

r_{1} = root 1 ---> **x - r _{1} = 0**

r_{2} = root 2 ----> **x - r _{2} = 0**

r_{3} = root 3 ----> **x - r _{3} = 0**

you just line them up and distribute

(x - r_{1})(x - r_{2})(x - r_{3}) = 0

and you end up with

x^{3} - **(r _{1} + r_{2} + r_{3})**x

^{2}+

**(r**x -

_{1}r_{2}+ r_{1}r_{3}+ r_{2}r_{3})**(r**= 0

_{1}*r_{2}*r_{3})