polynomial help (1 Viewer)

[AfroNerd]

i wasn't quite sure how to find m

Two roots of x^3 +mx^2+15x-7=0 are equal and rational. find m.

 

[HeroicPandas]

Do you know a relationship between a polynomial's roots and it's coefficients?

 

[BLIT2014]

 

[Drsoccerball]

i wasn't quite sure how to find m

Two roots of x^3 +mx^2+15x-7=0 are equal and rational. find m.

 

[BLIT2014]

http://community.boredofstudies.org/13/mathematics-extension-1/345490/polynomials-roots.html

 

[AfroNerd]

where did u get a^2 + 14/a = 15 from

 

[leehuan]

where did u get a^2 + 14/a = 15 from

By substituting his second equation into the first?

Just use InteGrand's comment that he linked though.