An equation with degree 3

  • Thread starter mahtaban
  • Start date
  • #1
2
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Main Question or Discussion Point

I have an equation similar:
8x^3+4cx^2+2(b-3)x+(a-2c)=0
a, b, c are real number.
if p, q , t be roots.
What can say about (p+q-2t) and (p^2+ q^2-2t^2)???
Please help me??
Thanks so much.
 

Answers and Replies

  • #2
Deveno
Science Advisor
906
6
hint: write your polynomial as 8(x-p)(x-q)(x-t) and multiply it out, then compare coefficients.
 
  • #3
2
0
I know
p+q+t=c/2
pq+pt+qt=(b-3)/4
pqt=(2c-a)/8
but I need value for
(p+q-2t)??
(p^2+ q^2-2t^2)???
Please help me??
 

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